This monumental work of art symbolizes the coming together of a previously divided city.

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

This abandoned airplane hanger is said to have once been a top secret launch facility.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Sleepy fishing port not included on many maps.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

An abandoned horror film set sits eerily along a highway through Hollywood's "door to the desert."

The world's largest concentrated solar power plant.

God's Saharan sandbox of wrath.

One of the most spectacular canyons in the world.

The world's first combination ski slope and power plant.

This sublime architectural marvel is a rare example of an expressionist church.

Hans Christian Andersen for the postmodern world.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

This now abandoned restaurant provides some of the most amazing views of Lisboa.

Catering to broken dolls for almost 200 years, this repair shop is now a charnel house of doll parts.

An old department store turned Nazi prison turned artist commune.

An abandoned swimming pool decays on the outskirts of Berlin.

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.

Berlin's old airport.

From toys to kettles to scientific instruments, this German museum celebrates the beauty of 20th century design.

A wunderkammer of mysterious objects and stories.

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

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