A fascinating insight into daily life in the Eastern Bloc.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

The remains of the iconic train crash from the movie The Fugitive can still be found rusting along the Great Smoky Railroad.

This large midwestern cavern features impressive rock formations and an underground waterfall.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

An ethereal glowing blue ocean cave in Croatia.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Dig for your own trilobites in this goldmine of invertebrates.

During the holidays, a vintage subway train whisks New Yorkers back in time.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

A subterranean shelter remains intact under a busy Paris railway station.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

The secret city built by the Manhattan Project.

Stalactites and stalagmites in a beautifully lit cave.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Not quite the menace it once was, this monster still has some chops.

A fantastic castle rumored to be the birthplace of King Arthur.

The hallucinogenic center of the ancient world.

The Grand Canyon of Texas.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.