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

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

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

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

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

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

The hidden lair of an alchemist rediscovered in a 2002 flood.

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

A hidden art gallery in an abandoned Warsaw fort.

Warsaw's fantastically preserved gasworks...almost.

These brass bunnies honor the rabbits that dominated the no-man's-land around the Berlin Wall.

A replica of the Liberty Bell rang daily from West Berlin's City Hall throughout the Cold War.

A century-old shot ball factory tower is open to the public once a year.

Metro station with a claim to rock n' roll fame.

This conical hill was built as a testing ground for an engineer known as the Glider King.

Berlin's old airport.

A 12th-century fortress containing some of Berlin's oldest buildings.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

A wunderkammer of mysterious objects and stories.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.