A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

The most visited, and possibly most controversial, museum in Germany.

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

Come stay at a live-in art installation.

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

Floating swimming pool within a moored vessel.

Started as a kitchen garden, now the second largest botanical garden in the world.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

The metal-free wooden towers of Brück.

The ruined remains of the airport Claus von Stauffenberg departed in his failed attempt to kill Adolf Hitler.

This historic stone bridge has an entire neighborhood clinging to its sides.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

The silly symbol for an underground protest group is now scattered around the city.

Crammed inside this grounded passenger plane is a bar that was once a Communist hang out and is now a ratty relic.

Living trees form the structure of an open-air palace.

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

The home of the morbid art of corpse plastination is open for visitors to view the fascinating, but stomach-churning process.

These 18th century gardens tell a rocky story of the son of Odysseus.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

Tallest - but not most powerful - wind turbine in the world.

A pyramid in Central Europe of unknown origin.

This mysterious and once-grand memorial still embodies a remarkable architectural vision.

A man-made slag heap that you can "ski" down, and is home to the world sandboarding championships.