Thirty creepy ghosts now inhabit this decaying 14th-century church.

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

A bus with a butt and biceps to put Olympic athletes to shame.

An abandoned saucer-shaped monument in the Bulgarian mountains.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

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.

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

A sweet museum focused on beets.

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

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

Floating swimming pool within a moored vessel.

Berlin's oldest surviving academic architecture hosted decades of animal dissections.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

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

Super-heavy Nazi architectural experiment.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

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

Started as a kitchen garden, now the second largest botanical garden in the world.