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

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

Berlin's old airport.

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

When the rain falls, this drain system turns into a musical instrument.

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

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

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

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

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

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

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

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

Ruins of a German Castle on top of a towering stone pillar.

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

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

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A surreal museum of extraordinary industrial objects.

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

An eerie, derelict amusement park in Berlin.

A slice of central Asia in the middle of Berlin.

An enchanting landscape of ancient sandstone structures eroded into otherworldly shapes.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.