Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

Countless grotesque faces stare out from this eerie Prague art wall.

A Jenga-style cylindrical tower of books that appears to go on forever.

Two stunning 17th-century libraries and a cabinet of curiosities.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

One of downtown Berlin's last reminders of its Communist past.

Where once there was a train station bathroom, there is now this German burger joint.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The most visited, and possibly most controversial, museum in Germany.

Obscure and obsolete publications are given new life as works of art.

Failed state-supported institution meant to rehabilitate students with intellectual disabilities.

An abandoned subway tunnel that could have reinvigorated Staten Island still lies somewhere beneath this Brooklyn park.

In the back of a nondescript sports bar is a museum-worthy mural by legendary cartoonists.

A town trapped in time - 1958 to be exact.

The origins of midtown Manhattan's anachronistic wooden farmhouse remain a mystery.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A little lighthouse in New York City, surrounded by mysterious stories of insanity-driven construction.