A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

The risqué mixed-media sculptures are supposedly a metaphor for Czech politics.

A hip bar decorated with walls of golden skulls.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A terrific purveyor of natural history objects and curios.

A crumbling hospital from the 1850s on Roosevelt Island.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

A monument to Lenin has been transformed into a statue of everyone's favorite black-helmeted, fool-choking Sith Lord.

This unassuming museum's slogan translates to “there is a limit of sadness, anxiety has no limits."

The largest catacomb system in the world.

This attraction was abandoned after the Chernobyl disaster.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Witness traditional silk production in the Uzbek city that's been a hub of sericulture for over a thousand years.

One of the most ethnically diverse spots on the planet.

This park celebrates a sister city relationship that survived the Cold War.

More than 10,000 small mirrors cover the curved surface of the world's second-largest solar oven, located in a remote village in Uzbekistan.

A gigantic collection of teeny, tiny books.

A shrine of fire worship built on top of a natural flame.