Gardens representing parts of Asia, Europe, and the Mid East are tucked away among the Soviet-style buildings in East Berlin.

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

A wunderkammer of mysterious objects and stories.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

A collection of abandoned typographic signs from Berlin and beyond.

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

A surreal museum of extraordinary industrial objects.

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

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

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

An eerie, derelict amusement park in Berlin.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

An ancient city hidden in the heart of the Sierra Nevada mountains.

This gracefully curving formation looks like a massive wave that was suddenly turned to stone.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

A centuries-old fortress city lies in ruin.

The second-longest continuous wall on the planet protects a hidden secret in the deserts of India.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

This ancient temple is set up to take you on a pilgrimage of self.

This pair of small sea rocks has been "wed" using rope and ancient Shinto tradition.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

The original "capsule building" is a masterpiece of Metabolist architecture.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.