Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

An old department store turned Nazi prison turned artist commune.

An abandoned swimming pool decays on the outskirts of Berlin.

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

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

This concrete residential area doubles as an open-air gallery.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

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

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

When German-Iraqi relations broke down, this embassy was vacated post haste.

A restaurant and observation deck built in a unique broadcasting antenna.

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

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

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.

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

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.

Art and a pun, all in one.

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

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

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

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