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.

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.

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

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

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

Tiny memorials honor individual victims of the Holocaust.

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.

Cold war icon and onetime "hole" in the iron curtain.

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

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

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

The real life town from the Pied Piper of Hamelin has a mechanical puppet show that retells the famous story many times a day.

The world's oldest rose is so tough it survived being bombed in World War II.

Striking occult iconography on a medieval German church.

Amsterdam's Red Light District leaves little to the imagination.

Amsterdam's former hotspot for public executions and dissections.

A public urinal so pretty, it was declared a national monument.

The former home of a mad diplomat is said to still be marked in bloody, arcane scrawls.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This unattributed sculpture in Amsterdam is hiding in plain sight.

The history and future of cannabis.