The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A mysterious air force base built to resemble a Long Island fishing village.

This elaborate towering structure was once famed for its revolutionary height.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

A historic covered bridge is but one example of an oddly prevalent American urban legend.

One of New Jersey's oldest surviving buildings still bears the mark of our former British overlords.

The ruins of an ancient island city built atop a coral reef in the South Pacific are spectacular and strange enough to have inspired H.P. Lovecraft.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Moscow's imposing monument to the Space Age.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

One of the world's tallest statues is also one of its most hated.

Former headquarters of the KGB.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

This colonial fort is an intriguing example of Renaissance military architecture.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The unbelievably opulent home built for an infamous newspaperman.

An overlooked memorial honoring the local Washington residents who died in World War I.

One critic described it as "middle Mussolini, early Ramses, and late Neiman-Marcus." Another called it an architectural "natural disaster."

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.