Former headquarters of the KGB.

A monument to Malchik, a stray dog who lived in a Moscow metro station until his tragic death.

Art installations, derelict railcars, and endangered grasshoppers all call this south Berlin park home.

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

An eerie, derelict amusement park in Berlin.

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

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

This public observatory is home to the "celestial cannon," the longest pointable telescope in the world.

An old tram depot transformed into a vintage car paradise.

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

Super-heavy Nazi architectural experiment.

Berlin's old airport.

A historic fire call point.

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.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

This watchtower once presided over the Berlin Wall.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

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

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

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

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

A museum dedicated to a Cold War era sausage.