This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The site of Paul Revere's historic two lantern warning.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The "lovely red Vega" of the legendary record-settling pilot.

Home to items never before seen by the public.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

This playground sculpture of an icon from the past is dedicated to the children of the future.

This inanimate goat created by the "welding nun" has been helping to clean up the city of Spokane for more than 40 years.

A massive sea stack famous for its appearance in The Goonies.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Despite a legend that says this highest peak in Oregon was climbed in high heels, scores of people have died on its slopes.

The highest point in Washington state is a volcano covered in glaciers.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

This famous city eluded concrete detection until the early 2000's.

Roman ruins top white travertine terraces formed by ancient hot springs.