The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

Berry Gordy Jr.'s old home was the original headquarters of Motown Record Corporation.

One man's attempt to create an artistic wonder on a run-down block in Detroit.

Detroit housing collective working to create an "environment for revolutionary change."

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

An underground city of salt.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

The only road through the heart of Glacier National Park.

This amazingly preserved Gold Rush town is a historian's dream.

Turkish adventurer antiques in the heart of the Grand Bazaar.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

Monument to a suicide protesting the Soviet invasion.

Looming communist pillar with a Czech twist.

A church of bones, decorated with 40,000 human skeletons.

A miniature train-ride through Slovenia's largest cave system.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

The "dragon babies" of southeastern Europe.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

A shrine of fire worship built on top of a natural flame.

A gigantic collection of teeny, tiny books.

Mysterious hillside with a continuously burning natural fire.

Despite producing just a handful of movies, a brave and lyrical filmmaker has an entire museum dedicated to him.