One of the oldest cemeteries in Germany was originally used for victims of a cholera epidemic.

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

This obscene artwork on the side of a newspaper office pokes fun at a rival paper's former editor-in-chief.

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

Once a path for Jewish funeral processions, this unassuming alleyway is rich in local lore.

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

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

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

A brush maker used his factory to protect blind Jews from the Gestapo.

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

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

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

A traditional U-Bahn station in Berlin gets a string of rather untraditional benches.

Tiny memorials honor individual victims of the Holocaust.

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

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

A monument to the man who almost killed Hitler.

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

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

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

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

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 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.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.