For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

A slice of central Asia in the middle of Berlin.

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

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

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

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

A monument to the man who almost killed Hitler.

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

Constructed on the ruins of a convent, this tower saved countless lives.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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.

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

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.

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

Berlin's old airport.

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

Tiny memorials honor individual victims of the Holocaust.

Once home to one of the oldest banks in the world, this building is also where Marco Polo's famous travelogue was written.

The tallest city hall in the world offers an excellent bento box.

Nelson Mandela lived here with his family from 1946 until his arrest in 1962.

The stunningly blue waters of these beautiful caves also have a violent past.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

This cave overlooking the Indian Ocean has been turned into a shelter and makeshift museum.