At this cemetery, artists are invited to design their own gravestones.

The largest manmade caves in Europe now function as a motorbike club's headquarters.

Twelve sweet, nutty, life-sized statues are housed in this second-story shrine to almond paste.

The NASA scientists behind Apollo 11 started out developing Nazi weapons at this abandoned German rocket factory.

An elevator into the Baltic Sea.

The site of one of the largest prison escapes of World War II.

What was once an underground Nazi city is now Europe's largest bat reserve.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

This mine is home to the largest man-made hole in Europe.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

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