Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

It's always summer at the beach inside this former airship hangar.

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

A German apartment building hosting as many trees as human occupants.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

The footprint of a frustrated devil in Munich's Cathedral.

An elevator into the Baltic Sea.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

The prototype for all Nazi concentration camps.

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

These bronze pamphlets remember a remarkable group of Germans who fearlessly opposed the Nazis in the very center of their power.

This conical hill was built as a testing ground for an engineer known as the Glider King.

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.

This "floating railway" is one of the world's oldest monorail systems.

A 12th-century fortress containing some of Berlin's oldest buildings.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

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

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

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

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

This classic restaurant features a gorgeous mirror-clad room.

Ruins of a German Castle on top of a towering stone pillar.