Outlaw Star: The beginning of the 21st episode, Grave of the Dragon (00:16-01:19), explains that Stonehenge is only one of many mysterious ruins, found on other worlds, that are believed to have been left by the same advanced alien civilization.
Agatha Christie's mysterious eleven-day disappearance is resolved somewhat as her being knocked unconscious by the drowning of a mutant-Reverend alien wasp called a Vespiform and the Doctor taking her into the TARDIS to be deposited ten days later, him previously knowing of her disappearance.
But none of that really counts when you remember (or don't) that the Silence have been manipulating humans for years. Then you remember (or don't) that we're not even told why.
In Aladdin, Aladdin and Jasmine fly the magic carpet to Egypt and a shocked stonemason breaks the nose off the Sphinx.
In the first Alien vs. Predator film, the Aztec pyramids are implied to have been built for the Predators, who came as godlike beings to earth thousands of years ago, demanded human sacrifices, and gave humans advanced technologies (such as the one necessary to build said pyramids).
In From Dusk Till Dawn, the ancient Mayan/Aztec temples were implied to be places where the blood-lust of vampires was appeased.
At the end of The Rocketeer, Neville Sinclair steals the rocket pack but ends up crashing into the "HOLLYWOODLAND" sign and exploding, converting it into the now-famous "HOLLYWOOD" sign.
In The Santa Clause the pole at the North Pole is a keypad stand, you need the correct code in order for the Sleigh to enter Santa HQ.
In Starman, it's implied, though not explicitly stated, that the huge meteor crater in Arizona was built as some kind of alien spaceship landing site.
In Stonehenge Apocalypse, Stonehenge, the Great Pyramids, and masses of other landmarks turn out to be hiding vital catalysts for the End of the World. All the pyramids-unravelling-and-becoming-volcanoes should be fair warning, however the film fails to mention by who or what, or why, any of it was built.
The first Transformers live-action film reveals that Hoover Dam was actually a Sector 7 research facility that stored a lot of their finds, including the Allspark and Megatron.
In the second live-action Transformers film, the Great Pyramid was built to hide the Sun Harvester which a corrupt Prime had brought to Earth.
In 2012, the Ganges Dam in China was revealed to be hiding the construction of the Arks.
In Animorphs one of the Pyramids of Giza was built over the Time Matrix.
In Roman de Brut, in 1155, Wace illustrated his belief that Merlin had constructed Stonehenge with the assistance of a giant.
In Kurt Vonnegut Jr's The Sirens of Titan various Earthly achievements are actually the result of psychic projection from the planet Tralfamadore; Salo, a stranded Tralfamadorian on Titan, the largest moon of Saturn, watched these through his telescope, decoding human monuments like the Pyramids and the Great Wall of China as messages in his own language, like, "A replacement part is on the way."
In the PC adventure game The Omega Stone, several famous landmarks (the Giza pyramids and Sphinx, Stonehenge, Chichen Itza and the Moai), along with yet-undiscovered ones at Bimini and in the Aegean, were constructed as part of a globe-spanning mechanism to destroy a comet that would impact the Earth one day. Stonehenge was also calibrated to come into alignment with certain celestial bodies just in time to warn future generations that the cometary strike was imminent.
The upcoming game The Secret World centres itself around the concept that EVERY real world myth, urban legend, and conspiracy theory is, in fact, true and claims to have entire missions devoted to each of them. The tagline is "everything is true".
Parodying National Treasure (see above), American Dad! reveals that the Lincoln Memorial was built to conceal the headquarters of the Illuminati Illuminutty, a peanut-based conspiracy surrounding George Washington Carver's total lack of responsibility for the invention of peanut butter.
In the Looney Tunes short Louvre Come Back to Me, Pepe Le Pew (the skunk) visits the Parisian museum, and his trademark odour alters many famous works of art. He causes the arms to fall off of Venus de Milo.
Five hats means that five tropers think it is ready to publish.
You are saying that you think this draft is ready to be published. That means the description is not ambiguous,
it doesn't duplicate an existing trope, there are at least three examples, and the title makes sense.
Is that what you meant to do?
You are saying this draft has a ready-to-publish hat it does not deserve and you are taking it back.