->''"I have said this before, and I do feel it is worth reiterating for those of you about to embark on archaeology degrees: ancient and powerful civilizations do '''NOT''' leave dangerous weapons lying around on the '''off chance''' that their descendants might someday find themselves in a tight squeeze and '''need''' them."''
-->-- Professor [[{{Whoniverse}} Bernice Summerfield]], "Beyond the Sun"

Beyond SchizoTech, beyond ScavengerWorld, there's LostTechnology.

AppliedPhlebotinum. Similar to ImportedAlienPhlebotinum, with the catch that the current population comprises the survivors or replacements of [[AndManGrewProud an age that fell due to its arrogance, war, or some other catastrophe.]]

Let's face it. [[{{Precursors}} The Ancients]] had some pretty ''neat'' gear. Robots, weapons, even the answer to Life, The Universe, and Everything ([[spoiler:42]]). [[InWorkingOrder Easy to use]], little or no maintenance required, and [[RagnarokProofing after thousands of years of neglect often still in perfect working order]]!

...oh yeah, and this technology completely and utterly destroyed the Ancients [[AfterTheEnd and most of the world]] with it. But that doesn't stop the villains (or the heroes) from wanting to get some for themselves. Usually, said LostTechnology then tries to destroy the world ''again.'' Some, but not all, heroes are smart enough to try to keep people away from the stuff.

Occasionally the good guys need LostTechnology to combat ancient evils that have arisen again (or villains who have acquired LostTechnology of their own). They usually use it as best they can, despite {{Black Box}}es. Often, this is the [[SuperHeroOrigin origin]] of a SuperHero.

May also show up in the guise of Lost Magic in fantasy settings. Often a consequence of NoPlansNoPrototypeNoBackup. Also see SufficientlyAdvanced and PointlessDoomsdayDevice.
----
!!Examples

[[foldercontrol]]

[[folder: Anime and Manga ]]

* TheCity in ''{{Blame}}!'' is so ''[[UnnecessarilyLargeInterior immeasurably vast]]'' that "lost" technology is positively ubiquitous. For a more obvious example, Killy's [[WaveMotionGun weapon]] is revealed to be an ancient and legendary piece of technology that nobody has been able to replicate. [[DullSurprise He is mildly shocked to learn this]].
*Keeping people from (while recklessly getting into) the stuff is a major premise of ''GalaxyAngel'', which is called Lost Technology in the series. The serious ''GalaxyAngelGameverse'' has it in droves, but replace backtalking missiles with, say, dangerous ones.
*The Demon God Androids, the Eye of God "Death Star", the Trigger of Destruction battleship, etc. etc. from ''ElHazardTheMagnificentWorld.''
*''{{Mai-Otome}}''
* ''MagicalGirlLyricalNanoha'' has a ton of this stuff, and it's always a major part of whatever crisis the main characters are facing. Magic was specifically nurtured and developed in order to handle the multiple times someone finds a "Lost Logia" and accidentally (or intentionally) pushes the "destroy planet" button.
*Showed up often in ''BakuretsuHunters''.
*The demi-armors from ''MazeMegaburstSpace''.
*The eponymous airships in ''{{Simoun}}'' are so far lost that their origin isn't clearly remembered. [[spoiler:Knowledge of how to use them is only regained through time travel.]]
*''{{Texhnolyze}}''
** Technically the technology is only lost to the population of Lukuss - the Class and the Theonormals never lost it.
* The doll Emily in ''SoukouNoStrain'' turns out to be LostTechnology... with [[PoweredByAForsakenChild dubious origins]].
* An ancient war machine forms a important part of the plot of ''{{Nausicaa Of The Valley Of The Wind}}''.
* Due to citywide amnesia, the megadeuses from ''TheBigO'' are LostTechnology despite being little more than 40 years old.
* Boson Jump and Phase Transition technology in ''MartianSuccessorNadesico''.
* In ''MurderPrincess'', the LostTechnology is actually ''called'' Lost Technology, proper noun. [[spoiler:All of the world's "magic" and monsters, as well as the heroine's two companions, were born from Lost Technology, and when its "central processing unit" is destroyed [[NoOntologicalInertia so is everything it created]].]]
* This is the whole basis of the manga ''666 Satan'' (aka ''{{O-Parts Hunter}}'') with [[spoiler: the most ultimate of lost technology able to restart the universe itself.]]
* ''TrinityBlood''. Not only is it actually called LostTechnology but they even heavily analogize LostTechnology to magic by giving it mystical references.
* The technology of Laputa in ''CastleInTheSky''. Unusually, it did not destroy them; they voluntarily threw it away because it was alienating them from [[{{Arcadia}} the earth]].
* The main theme of ''TurnAGundam''. To fight back against the alien humans of the Moon Race, Earth (which appears to have somehow gone back to the Victorian era) starts digging up old mobile suits and battleships it finds. Turns out [[spoiler: we're seeing the end of all the then known Gundam timelines. The Turn A was so powerful it sent humanity effectively back to the stone age, with only the Moon Race retaining video documentation of what happened.]]
** Also used as the plot for the more kid aimed spin off ''Musha Generation'', alabeit with the mecha now super deformed, more fantasy elements to the cast and the overall theme being the way of the samurai.
* ''{{Trigun}}'', very much so. It even uses this exact expression ("[[GratuitousEnglish Lost Technology]].")
* ''GunXSword'' is a SpiritualSuccessor to ''{{Trigun}}'' and also uses this. Two examples are the feuding sisters [[spoiler: who turn out to be clones whose father actually saw them as experiments not children, and neither they nor the other characters know what the word clone means]] and that [[WhatDoYouMeanItsNotSymbolic cross puzzle Van tries to open]] which turns out to be an electromagnetic shield for his mecha.
* Lost Universe with its Lost Ships and Psi Weapons.
[[/folder]]

[[folder: Literature ]]

* In [[IsaacAsimov Asimov's]] ''{{Foundation}}'' novels, most of the galaxy loses its tech when the Empire collapses; the Foundation preserves, improves and reintroduces it. In the later novels, [[spoiler: sentient robots]] are a lost technology universally believed to be mythological, until the heroes meet the [[LastOfHisKind last surviving one]] in the final pages of the last book.
* TerryPratchett's ''{{Discworld}}'' novel ''Thud!'' introduced LostTechnology in the form of "Devices", mysterious magical/technological devices found and utilized by the dwarfs.
* Lost technology and the ruins of long lost high-tech civilisations turn up in the ''DyingEarth'' novels (and the fantasy RPG) by Jack Vance, as well as in several of his other short stories (both Fantasy and Science Fiction).
* There are hints of a previous, lost technological civilisation in some of the ''{{Shannara}}'' novels, a Fantasy series by author TerryBrooks. In ''Sword of Shanarra'', the characters are told the civilisation destroyed itself with powerful weapons, and encounter a mutant-cyborg monstrosity in a ruined city. This aspect is not played up so much in the later novels, although the BigBad in one is an AI from the old world.
** Brooks is currently linking this to his Urban Fantasy series ''World/Void'': the ''Genesis of Shanarra'' series is set AfterTheEnd of ''World/Void''.
* RobertJordan's ''WheelOfTime'' series heavily plays the Lost Magic angle up, stocking the world full of unknown thousand-year-old devices mostly in working order, sometimes harnessed and sometimes just accidentally triggered. The Hero is given glimpses into the pre-cataclysm world, as well. At one point, the reader is afforded a glance at a "three-pointed star in a circle, older than all the other objects, reeking of pride and vanity". Or, as we call it today, the Mercedes-Benz logo.
* Valyrian steel in ''ASongOfIceAndFire'', and though not really technology, in some weird manner, dragons.
** Valarian steel is a fantasy counterpart to a [[TruthInTelevision real-world]] "lost" technology: Damascus steel, which isn't actually lost so much as superseded.
**Damascus wasn't really superseded as much as made unprofitable, and the guild-kept secrets were lost due to lack of use. Quality forges of the renaissance were able to get good steel at a fraction of the cost of the labor-intensive damascene process. Even modern swordsmiths who make Wootz Damascus admit that despite the improvement in quality and beauty (and massively increased price), Damascus steel doesn't produce as much of a profit on a $/man-hr basis.
* In StephenKing's ''TheDarkTower'' Series; Roland's world has "Moved on" and is littered with forgotten technology from the time before. Some of these such as various robots and and a field of oil derricks become important plot points.
* In ''SecondApocalypse'', the remnants of the [[AlienInvasion Inchoroi]] are largely ignorant of their own old technology and use it in a BlackBox fashion. On the good guy side, the Heron Spear of legend that used to be wielded by the Inchoroi king can be identified by the reader as a laser gun.
* An ancient galaxy-spanning internet exists in VernorVinge's ''AFireUponTheDeep'', considered to have dangers such as viruses and outright lies as well as important secrets, with dire consequences ranging from destruction of a society's technology to the ruination of actual immune systems. The novel is about what happens when a malevolent power, the Straumli Perversion, is [[SealedEvilInACan released from one of these archives]] by a team of archaeologist programmers.
* In a ''StarTrekDeepSpaceNine'' novel, the crew of the ''Defiant'' runs across a world that was essentially SET UP this way as an experiment. A highly-advanced culture dropped off a whole bunch of their babies on a planet with tons of small, hi-tech devices scattered all over the place and sat back to see what would happen. We then get the people who are so dependent on technology they don't understand that they're royally screwed when the batteries go dead.
* In AynRand's ''Anthem'' Lost tech includes a subway system and an abandoned house.
* The series TheGeneral, by DavidDrake and S.M. Stirling (later, EricFlint steps in for Stirling), has a LostTechnology computer providing information for a planet at a development stage akin to the AmericanCivilWar on Earth, to eventually rebuild interstellar travel over a millennium after it was lost due to a galactic civil war.
* The titular quest in ''Hiero's Journey'' is about a search for lost computer technology in an AfterTheEnd world.
* T. E. Bass' ''Half Past Human'' depicts an Earth about 3000 years in our future, where humans have devolved into a four-toed variety (called the Nebish) and technology appears to have declined as well (although it's still higher than ours). There are two instances of Lost Technology in this novel, both owned by (and planted to assist) the few remaining five-toed outcasts; one gets dismantled by Nebish technicians, who fail to recognise it as a Class 6 cybernetic device, since it's small and portable and their understanding of Class 6 cybers is that the brain case alone would weigh over two tons.
* The city of Diaspar in Arthur Clarke's ''The City and the Stars'' (a novel-length re-working of his earlier novella ''Against the Fall of Night'' is composed of technology that no one living understands any longer; but which is all fully automated and self-repairing. Somewhat subverted in that the computer that maintains the city, including the inhabitants -- who are cloned reincarnations of the original population with memories of all their incarnations stored in the computer -- could conceivably produce new inhabitants with the requisite memories. The technology necessary for space travel, on the other hand, had been deliberately purged both from the city computer's memory, and the records of the telepathic inhabitants of the pastoral city of Lys; and the populations of both cities had developed a phobia of space travel, with a powerful [[spoiler: and completely wrong]] mythology justifying their fear.
* In the ''{{Warhammer 40000}} GreyKnights'' novel ''Dark Adeptus'', [[spoiler: Magos Antigonus]] is able to be NotQuiteDead thanks to some hitherto-unknown tech he finds shortly before he gets killed. The [[spoiler: Father of Titans]] is also shown to be comprised of tech that its copiers cannot replicate fully.

[[/folder]]

[[folder: Live Action TV ]]

* Pretty much the premise behind ''{{Stargate SG-1}}'' and ''StargateAtlantis'', as well as the movie that started the franchise.
* In the ''StarTrekVoyager'' episodes "Message In A Bottle" and "Hunters" the ship comes across a vast abandoned network of relay stations (over 100,000 years old; each powered by its own black hole!) enabling them to make contact with Starfleet on the other side of the galaxy.
* The entire ''{{Andromeda}}'' series is centered around a big piece of Lost Technology.
* LandOfTheLost was full of this, in fact the Land itself was a pocket universe created by Altrusian technology IIRC.
** The Land was a pocket universe created or modified by the Altrusians as a multiverse oasis/waypoint; with the pylons being part of their transportation and control system. A lot of the mythology/science behind the Land was altered during the [[CanonDiscontinuity canon-breaking third season]].
* Of the [[TheMultiverse many worlds]] encountered in ''{{Spellbinder}},'' both the Land of the Dragon Lord and the Land of the Spellbinders were based on lost and irreplaceable technology. In fact, [[CoolOldGuy Regent Correon's]] biggest goal in the series (besides helping Paul get home) is finding a way to repair power suits and flying ships- or construct new ones.

[[/folder]]

[[folder: Music ]]

* (yeah, DeadHorseGenre): in Rush's "2112", the TragicHero finds an electric guitar, just to be told by TheOmniscientCouncilOfVagueness that it's worthless and it caused the destruction of the elder race of man. [[spoiler: The hero can't take it anymore and commits suicide.]]

[[/folder]]

[[folder: Tabletop Games ]]

* Lost technology and the remnants of a star-spanning Galactic Republic are a central part of the setting of ''FadingSuns'', where mankind has descended into a new feudal age and most technology is considered sinful or even blasphemous by the Church.
* First Age artifacts, especially warstriders, from ''{{Exalted}}''.
* The Brothers' War that underpins nearly all of the early storyline of ''MagicTheGathering'' was begun when the two brothers found the LostTechnology of the Thran.
* The golden age of Humanity in ''{{Warhammer 40000}}'' was brought to an end around the 25th millennium by "soulless" [[TurnedAgainstTheirMasters rebelling]] [[AIIsACrapshoot robots]] known as Men of Iron and the advanced Standard Template Constructs that contained its technological knowledge were fragmented and scattered across the stars. The current [[TheEmpire Imperium of Man]] rebuilt human technology by recovering knowledge from these artifacts of the ironically-nicknamed "Dark Age of Technology". (The Dark Age of Technology is also, confusingly, known as the Golden Age of Technology. Whilst human technology verged on CrystalSpiresAndTogas at times, it is considered a spiritual dark age by the Imperium.)
** There is also lots of other 'archeotech' out there from several of the other races, mostly the Slann/Necrontyr and the Old Ones/Eldar. Its heavily implied that three of the main races from the setting are forgotten and lost biological weapons.
** Don't forget the Necrons, walking Lost Technology. They are ancient skeleton machines scattered through the universe.
** The most spectacular pieces of LostTechnology are the Talismans of Vaul, aka Blackstone Fortresses. Giant, space-station-sized, quasi-sentient weapons capable of channeling pure Warp energy; and the only weapons capable of destroying the C'tan. Created by the pre-Fall Eldar, who, although they possess the necessary level of technology to reproduce them, no longer have the knowledge of their construction, or the resources necessary to rebuild them.
*** Also, of the six fortresses found, [[spoiler:four were destroyed (by a Necron attack?) and two were captured by the Chaos]].
* ''GammaWorld'' is a haven for Lost Technology.
* Basically anything more advanced than a lighter in ''{{Rifts}}'' is either lost technology or reverse-enigeered from lost tech. The Glitter Boy is a shining example of both - not only do most of the suits in existence come from before the Cataclysm, but the only new ones come from Free Quebec, who managed to work out their mechanics.
** The exception being {{Magitek}}, the vast majority of which is imported from other worlds and/or dimensions; most notably the [[CosmicHorror Splugorths]] via Atlantis.
* BattleTech has '[=LosTech=]' which is ExactlyWhatItSaysOnTheTin. Well it's technically old Star League tech that was never proliferated, but don't go telling the Successor Houses that...
** Most of it ''was'' lost, as the factories and personnel who made the lostech devices were destroyed and [=ComStar=] spent hundreds of years slitting the throats of anyone who rediscovered lostech items so they could hoard the lostech (which they alone retained specifications and production facilities for due to their neutral status) for themselves and take over the galaxy once the Successor States had sufficiently ruined themselves. Then the Gray Death Legion sold a Star League memory core with an entire database of lostech on the black market and put the kibosh on [=ComStar=]'s grand scheme.

[[/folder]]

[[folder: Video Games ]]

* A twist on this is ''{{Fallout}}'', which takes place in a post-apocalyptic USA, beginning 84 years after a massive nuclear exchange that took place in the year 2077. The local BigBad has recovered terrifying LostTechnology -- in the form of a powerful Nuclear Weapon from the beforetime!
** Well, it's [[AfterTheEnd post-apoc]], so nearly everything in this game is LostTechnology. The best one? The G.E.C.K., of course. The ''Garden of Eden Creation Kit''. That's saying ''{{Phlebotinum}}'' with four letters.
*** Although the G.E.C.K. has two different interpretations. WordOfGod once stated that the G.E.C.K. is far from being phlebotinum, but is more a farm-starter kit. ''Fallout 3'', however, has it as an instant-terraforming device. [[WildMassGuessing Fans have a number of ideas for the discrepency.]]
* Central to the ''{{Halo}}'' series; the entire setting is one giant piece of LostTechnology.
** Though, it's also a subversion. It's not useful besides for taking over for living on(unless you're an idiot and let out the Flood), and if you do use it you DIE. Also, all the OTHER tech sucks or tries to kill you... or both.
*[=JRPGs=] are fond of this, especially Square:
**Nearly every early ''FinalFantasy'' game has some elements (6 and 7 as Lost Magic), usually just to give you a chance to dungeon crawl through a high-tech tower of some sort. No one ever thinks to pick up a dropped laser gun or study the tech for the betterment of the world, though.
**A major element in ''{{Wild ARMs 1}}'' and ''{{Wild ARMs 3}}''. In fact, [[spoiler:in the first game, the protagonist Rudy is ''made'' of lost technology, and one that nearly destroyed the world to boot.]]
**''{{Xenogears}}'' tends to flip-flop on whether Gears are or aren't lost technology. At the very least, Gears are dug up from ancient ruins, but it's painfully obvious that they can be tweaked and created via available tech in the more advanced areas. At the very least, the Omnigears are lost tech.
*** The remains of the Elridge, however, and the Zeboim civilization, very much fit the trope. The Merkaba, the "Treasure of Kislev," the Yggdrasils, and Emeralda herself are primary examples.
**''SecretOfMana'' centers around the attempts of the BigBad to acquire the ancient world-destroying Mana Fortress and Mana Beast.
**In ''BrainLord'', you fight through many gimmicky LostTechnology dungeons.
* In ''MassEffect'', a large part of the story revolves around the galaxy's dependence on AppliedPhlebotinum that were created by the Protheans, a mysterious race that died out 50,000 years ago. However, [[spoiler:it is later revealed that the Phlebotinum were in fact LostTechnology to the Protheans as well; they were created millennia ago by a race of Artificially Intelligent synthetic lifeforms, which are ''themselves'' LostTechnology.]]
** [[spoiler:Don't tell them that, it just makes them mad. They claim to have no beginning and end if asked who made them, and then try to kill you.]]
* ''{{Metroid}}'''s Chozo had marvelous technology, widespread over many a planet the player visits in a game, all of which Samus inevitably collects, blows up or uses during the plot to refill her BagOfSpilling.
**Ditto for their oneshot intergalactic Pen-Pals, the Luminoth.
*** To be clear: the Luminoth only developed seriously awesome technology in response to the appearance of the Ing. Prior to that, they were happy to have mostly harmless stuff, with the exception of the Planetary Energy Regulators, which were required to terraform Aether. Not so much Lost Technology, as technology they left behind as they fled.
* The Xbox remake of ''NinjaGaiden'' features a statue with floating stones. This power, it is said, "clearly shows that it was not made with modern technology" and "must be the product of an ancient age". [[ChekhovsGun It becomes important later]].
* The RPG ''DokaponKingdom'' actually has an item CALLED "Lost Technology." It unlocks a new character class, the Robo-Knight--male characters who use it become {{sentai}}-style mechs, while female characters become {{Robot Girl}}s.
* ''MegaManLegends'' is all over this trope. From the [[ScavengerWorld setting]] to the [[SealedEvilInACan plot]] to the [[DramaBombFinale Big Reveal]] at the end of the sequel to the ''[[GlobalCurrency world's money]]'', it all has to do with LostTechnology.
** Technically the Refractors are just sold as they are power sources for machines, they are not the GlobalCurrency. Zenny is the GlobalCurrency.
* ''[[MightAndMagic Might & Magic]]''. [[spoiler:In the case of the first five games, possibly deliberately lost, to keep people from messing up with the experiment that is the reason why their worlds' names are written in all Capital Letters. From a certain point of view, the {{Big Bad}} is ''himself'' a piece of malfunctioning Lost Technology. Might & Magic 6, 7 and 8? {{The end of the world as we know it}} resulted in a collapse of civilization bringing them down from energy-weapons to just being up to cannons a thousand years later, but some pieces of what was before are still around...]]
* The cultivators in ''{{Thief}} 2: The Metal Age''.
* Av Kamiw in {{Utawarerumono}}. Basically, giant Evangelionesque mechas in a world where a very few persons like herbalists know of gunpowder, and fear it too much to use it. {{Game breaker}} much? (They still go down to swords and arrows then it's the protagonists attacking, of course) The last stage of the game is also set in an abandoned research laboratory that has a few crumbling remnants of working technology, but it's generally useless stuff like holograms that tell us about the backstory.
* The JakAndDaxter games feature the shiny orange artifacts, structures, and machinery of the Precursors.
* Played with in TalesOfSymphonia and TalesOfPhantasia, where magitechnology ''was'' lost, but is just being rediscovered. [[WhatAnIdiot In both cases, as well as during the 4000 years inbetween, one of the first pieces of technology to be reconstructed and rebuilt by archaeologist/scientists is the Man Canon, the superweapon that destroyed the ancient civilizations that invented (and reinvented, and re-reinvented) magitechnology in the first place]].
** Played with further in ''TalesOfVesperia'', which revolves around "Blastia": LostTechnology that is well-researched, widely-used and vital to modern life in the world, even though the knowledge of how to create them has been lost. In another subversion of the usual formula, the solution to the heroes' problems is ''not'' using them.
* The earlier ShiningForce games features a cast of traditional fantasy warriors, magicians, and creatures battling traditional fantasy evils. Except for the occasional sentient robot that survived through time to help the heroes.
** Possibly averted when present day inventors have achieved SteamPunk levels of technology independently from the LostTechnology.
* In [[PhantasyStar Phantasy Star IV]], society has reverted to simpler, medievalish technology after [[spoiler: the protagonists of Phantasy Star II destroy Mother Brain, a supercomputer that controls all technology]]. Unfortunately, without her guidance, the technology controlling the planetary systems like climate, tectonics, and defenses, goes haywire and makes life tough for the survivors. At least until the heroes beat the BigBad and [[spoiler: let benevolent androids resume control of the systems.]]
** Interestingly, for being lost technology, a lot of it [[spoiler: is in plain sight, sitting visibly on the overworld map.]] Instead of exploring the obvious choices, archeologists were convinced random caverns held better secrets. [[spoiler: If [[ActionGirl Rika]] is any indication, they were right.]]
*** It's implied that the system installations that are out in plain sight are either impossible to get to due to environmental hazards (the ocean, a high population density of dangerous sand-worms, a cult) or protected from entry with dangerous laser barriers that were designed to keep humans out. Birth Valley is a huge discovery because there ''isn't'' anything stopping anyone from getting in (other than scary rumors).
* {{Skies of Arcadia}} - Gigas, anyone?

[[/folder]]

[[folder: Theater ]]

* The basic premise behind ''WeWillRockYou'', where music itself is the LostTechnology.

[[/folder]]

[[folder: Real Life ]]

* A great many of the Romans' construction techniques, such as how to make aqueducts, were lost for centuries once the Roman Empire collapsed, and the remains are still around today.
** Also, depth in paintings...if you look at some of the murals from Pompeii, they might well have been painted in the 1600s for how realistic they look.
* Don't forget so-called "Damascus" steel, which has been lost for centuries since the original iron deposits in India ran out (there was a key impurity in those particular iron deposits).
**It was figured out in the late 90's and there are now companies making bladestock from it. Modern bladesmiths have slowly been using it more and more. To prevent confusion with "Pattern-welded" steel, which was and is commonly referred to as "Damascus" steel, it is known by the original name for the ore: "Wootz".
** Damascus steel was dependent on both the wootz ores, and a complex heat-treating and tempering process that utilized the unique characteristics of the trace impurities in the wootz ores. It was the recent rediscovery of [[http://www.tms.org/pubs/journals/jom/9809/verhoeven-9809.html both the type of ore and the heat-treating process]] that allowed the replication of Damascus steel.
** It was only "lost" in Europe. The Japanese developed an almost identical process using iron ores very similar to the wootz type, and even more complex heat-treating and tempering techniques; resulting in swords that equalled or rivalled wootz Damascus steel in quality. The swordmaking tradition has been effectively maintained almost contiguously since it was originally developed; and in modern times, a few of these master swordsmiths have been elevated to the status of "living national treasures". In fact, it was in large part the knowledge of the Japanese techniques that allowed the Damascus steel process to be replicated.
*** Except that this is complete and utter bullshit. Nipponese steel was not of similar make-up to wootz steel. Japanese swordsmithing was not particularly complex, it merely involved more folding, and Japanese blades did not rival Damascus steel.
* There is also Greek Fire, which could not be put out using water, of which the formula has been lost for ages.
** Today the problem of finding out what it was is more related to that there are several options - there is more than one known way to make fire that can't be put out with water.
*The US goverment forgot how to make a material used in trident missile production codenamed Fogbank.
**{{Science Marches On}} According to that other wiki Fogbank was successfully reproduced in 2007 and the first refurbished warheads containing it will be transferred from the DOE to USN in fall 2009.
* The [[http://en.wikipedia.org/wiki/Antikythera_mechanism Antikythera mechanism]] was a mechanical device for computing the position of the Sun, Moon, and the planets from a date and time. Its parts are on par with 18th century clocks in terms of complexity. It was made in the ''2nd century BC''.
* The Stradivari violins were made using secrets that were given from master to apprentice, and most of those secrets are lost today.
** Plenty of studies have been made with high-tech equipment on these violins to find out the hidden factor. At the moment, the primary component is suspected to be the quality of the wood, which is ever so slightly rotten to give it its unique sound. Experiments are being made to replicate the technique, but since the Stradivarius-violins are so old and expensive, the chances are that it will take longer to convince people that new violins can sound as good, than it will take to actually make them.
** The most recent studies have more or less concluded that the characteristics of the Stradivarii violins were due primarily to three factors. 1) The use of salt-water cured wood (logs were stored for long periods in the commercial harbours before being dried and sold. This broke down the lignins in the cell walls, resulting in a more flexible, more resonant wood. 2) An unusual varnish incorporating ground quartz; a mineral with unique electro-mechanical properties. The quartz particles acted as a sort of resonance filter, damping high-frequency harmonics and resulting in a mellower tone. 3) Some quirks in the manufacturing and tuning process unique to Stradivarius and his students.
* Literally lost, supposedly were the blueprints and other info on the Saturn V rocket. [[UrbanLegend Some say]] this was inhouse sabotage because NASA was dedicated to building the Shuttle and didn't want any alternatives getting in the way.
** This is a myth. The Saturn V plans were never lost. The reason we can't build a Saturn V today is that the plans call for parts that were made in the mid-1960s and are no longer being manufactured.
* The so-called Baghdad Batteries. While significantly less powerful than that 99 cent Duracell you buy at 7-11 and requiring an entire vase (not a cheap item in those days) they were fully functional 1800 years ago. Naturally, this raised the question of why people made them in the first place. While the current explanation is for electroplating gold, no one actually knows.
* Götz von Berlichingen, a 15th-16th century German knight, had a prosthetic iron arm that could be properly used for holding and using things. Almost five centuries later we're still struggling with functional ArtificalLimbs.
** Paritally incorrect. It could hold a sword because the sword was plced in the hand and then the fingers were bent around it. Once in that position he couldn't open the hand unless the fingers were again moved. An additional artifical limb used a strap system to allow the hand to open if you straightened the arm and close when you bent it. However, I thnk that is later.
* The schematics for the Apollo vehicles, which were written on computers that no longer function, and cannot be read with modern computers. See NoBackwardsCompatibilityInTheFuture.
** It is at least possible to rebuild the [[http://www.universetoday.com/2009/07/14/build-your-own-apollo-11-landing-computer/ control computer]] from Apollo 11
* The A-10 Thunderbolt, only 715 of which were made, and has NoPlansNoPrototypeNoBackup, so spare parts have to be scavenged from non-functioning planes.

[[/folder]]

[[folder: Western Animation ]]

* In the ''{{Futurama}}'' episode ''Mother's Day'', Fry reinvents the wheel (which he shapes like an oval) after the robots rebel.
* Many of the Arkadian devices in ''SpartakusAndTheSunBeneathTheSea'' could count as LostTechnology; their creators died long ago and nobody today knows how to fix them - which is Very Bad because their artificial sun is dying.

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<<|AnimeTrope|>>
<<|AppliedPhlebotinum|>>