A small hippo-shaped fountain in Berlin, Germany.

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

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.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

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

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

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

A fascinating insight into daily life in the Eastern Bloc.

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

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

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

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

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

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

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

A statue of an astronomer gazes at the sky as a tribute to Caroline Herschel.

This monumental work of art symbolizes the coming together of a previously divided city.

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

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

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

Berlin's old airport.

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

The world's first clock to use set theory as a measure of time required the invention of a new light bulb just to maintain its obtuse measurements.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.