The remains of an idyllic small town built for the film 'Big Fish' still stand around a rundown main street.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

A failed utopian experiment for British expats in the American South is now a Victorian village frozen in time.

More than five miles of underground passageways.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

What was once the largest NFL stadium.

The abandoned Japanese amusement park once loomed as a dystopian Disneyland.

A series of modernist treehouse hotel rooms grace the outskirts of an Arctic forest.

A natural wonder in south Denmark.

An abandoned water sports stadium that has become a haven for graffiti and decay.

A beautiful geyser under environmental threat.

Every autumn, this hillside is ablaze with red summer cypress.

Pompeii's less famous neighbor is still revealing her secrets.

Centuries-old bridges grown from tangled roots.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

An ethereal glowing blue ocean cave in Croatia.

A gargantuan crystal kingdom.

Stroll through a wonderland of stupendous moss-covered trees.

The abandoned husk of a mental institution that failed to save a Jazz Age icon still sits nearly unchanged.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Hollowed out cedar log tubs set in an ancient towering forest.

Once the most densely populated place in the world, this island is now a ghost town.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.