A century-old shot ball factory tower is open to the public once a year.

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

The 1852 novel "Uncle Tom's Cabin" lends its name to a subway station, a street, and several shops on the edge of Berlin.

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

Floating swimming pool within a moored vessel.

The abandoned remains of this Victorian brewery hide crumbling bowling alleys and rusting industrial gear.

Blitzkrieg bop your way through Berlin's Ramones Museum.

This museum is home to a sugar sculpture of the Berlin Airlift Memorial.

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

Inside this Jewish cemetery is a memorial to soldiers who deserted the German army and were executed.

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.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

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

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

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

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

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

Tiny memorials honor individual victims of the Holocaust.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

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

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.