Floating swimming pool within a moored vessel.

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

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

A stairway to heaven, or to nowhere at all.

An intricate and amazing house built by architect Karl Junker.

"The most colorful grottoes of the world.

A striking 12th-century-style castle built on the edge of a cliff.

A fascinating insight into daily life in the Eastern Bloc.

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

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

Art and a pun, all in one.

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

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

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

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

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

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

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

The Swiss hilltop housed an early 20th-century vegetarian nudist colony.

Featuring a meatless buffet fit for kings, this family-owned Zurich eatery is considered the oldest vegetarian restaurant in the West.

The idyllic island where the philosopher Jean-Jacques Rousseau spent “the happiest time of his life.”

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.