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

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The first, and perhaps only, monument dedicated to Wikipedia.

Explore the complex ecology of this multifaceted nature preserve by riverboat.

The site of a concentration camp where inmates were made to take part in one of the largest counterfeiting operations in history is now hauntingly empty.

Terrifying derelict military hospital once housed a recuperating Hitler.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

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

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

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

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

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

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

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

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

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

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

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

Berlin's old airport.

A towering monument to war, located on a beautifully peaceful hill.

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

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.

This water-tower-turned-high-end-apartment building was once the site of an early Nazi concentration camp.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.