History Main / HollowWorld

* EdgarRiceBurroughs' ''Pellucidar''.

* EdgarRiceBurroughs cemented the concept in pulp with Pelluciar, an internal world where he set several of his stories, including a notable crossover with Tarzan at Earth's Core.

* The {{Synnibarr}} roleplaying game's titular planet is hollow. According to the backstory, Earth's sun was becoming unstable, and because Earth itself was physically unsuitable, the planet's stellar engineers took Mars and expanded it, hollowed it out, and terraformed it until it was completely unrecognizable to serve as a new home for the evacuated human race. Overlaps with ThatsNoMoon, as a suitably huge power generator was installed in Synnibarr's core to power the artificial planetary heating and atmosphere systems as well as the engine designed to propel the planet to a new star system to take up orbit in. After dozens of catastrophes, wars, and invasions during the 40,000 year journey, the inner core of the planet was abandoned, with the planetary machinery almost completely inaccessible at the top of a thousand-mile high mountain ascending to the planet's geographical core.

* ''FinalFantasyIV''.

* The world of DwarfFortress may or may not be spherical, but it's hollow alright, as your dwarves may discover [[DugTooDeep the hard way]].

* [[http://wwwfacstaff.bucknell.edu/dgriffin/Research/Griffin-HE_in_Science.pdf What Curiosity in the Structure: The Hollow Earth in Science]] by Duane Griffin, is a short historical paper surveying scientific thinking about the hollow earth up to the present day.
* The Hollow Earth Insider

* ''Hollow Earth: The long and curious history of imagining strange lands, fantastical creatures, advanced civilizations, and marvelous machines below the Earth's surface'' by David Standish goes into detail on the fictions, theories, and wacky religions inspired by this trope.

* An unfalsifiable (and therefore scientifically irrelevant) claim is that the earth is in fact a hollow sphere with the universe inside and geometry transformed to match (i.e. the closer in you go, the smaller you get).

* The city of Arkadia in ''SpartakusAndTheSunBeneathTheSea''.

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!!Ezamples

* Another DCU example: Steve Conrad, a GoldenAge adventurer, explored a LostWorld called Mikishawm inside the Earth.

* Margarat Weis and Tracy Hickman's TheDeathGateCycle's second book, Elven Star, features one of these, where all the stars in the sky are [[spoiler: the equivilant of gigantic lighthouse beacons]].

** ''{{Pathfinder}}'', as a nod to ''Pellucidar'', has a inverted vault in it's underdark-analogue, complete with otherwise-extinct animals. it's more like a mini-world than an actual hollow planet, though; an ancient terrarium of Sufficiently Advanced...somethings.

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So, mainstream scientists today believe that the Earth under our feet has a lot of molten rock and metal filling it and have gathered a lot of pretty good evidence for it. The only complication is that we've never been able to send a human down more than several miles to actually study it up close, largely because NoOneCouldSurviveThat. Which is why since times that are OlderThanRadio, early scientists, writers and more than a few crackpots have believed that there just might be something...or indeed, someone (say, UltraTerrestrials)...down there, possibly powered by a suitably sized sun in the center.

* ''SepterraCore'' takes place, as the name suggests, on seven massive continents or 'Shells' whose orbit and level are controlled by a [[MasterComputer central core]] with [[MagicalComputer mythical wish granting powers]].

* ''SepterraCore'' takes place, as the name suggests, on seven continents or 'Shells' whose orbit and level are controlled by a central core with [[MagicalComputer mythical wish granting powers]].

* ''SepterraCore'' takes place, as the name suggests, on seven continents or 'Shells' whose orbit and level are controlled by a central core with mythical wish granting powers.

* ''SepterraCore'' takes place, as the name suggests, on seven continents or shells whose orbit and level are controlled by a central core with mythical wish granting powers.

* The movie ''The Mole People'' featured a team of scientists going [[MST3K down, down]] beneath the surface of the Earth to find another society of humans, along with the eponymous Mole People.

* Also by StephenBaxter, a short story called "The Eighth Room" is set on a planet Earth that has been ''folded in on itself''. There is no sky -- people looking up see the other side of the planet curving over them, as if it's a shell. When one character uses a hot-air balloon to explore the other side, she witnesses the "shell" flatten out and then become curved normally, [[AlienGeometries while the land she just left curves into a shell over the sky]].

* In the semi-sequel to ''TheTimeMachine'' called "The Time Ships" (by Stephen Baxter), the traveller returns to the future to find it changed. The Morlocks are good this future, and have engineered a hollow sphere around the Sun slightly inside Earth's orbit. Morlocks live on the outside of this hollow sphere in the dark, while the Eloi live on the sunlit inside of it.