The final resting place of many of Germany's most famous communists.

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

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

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

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

Floating swimming pool within a moored vessel.

Super-heavy Nazi architectural experiment.

Berlin's old airport.

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

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

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

Named after a militant urban guerilla, this famous former squat is a graffiti-covered stronghold of leftist culture.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A monument to the man who almost killed Hitler.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Tiny memorials honor individual victims of the Holocaust.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

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

Cold war icon and onetime "hole" in the iron curtain.

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

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

An old department store turned Nazi prison turned artist commune.