This walkway is so narrow it needs its own light to stop pedestrian traffic jams.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

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

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