This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

This ghost town was once a cult-like religious utopian settlement.

Abandoned silver mine strewn with wrecked and twisted structures.

A series of five defunct panopticon prisons in Cuba.

This picturesque mansion has gone from opulent ruin to nature museum.

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

Hidden amid the tropical forest in the Caribbean Sea are the decaying ruins of the Cocaine King's luxurious island party home.

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

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

Invading U.S. troops were first seen from this now-abandoned tower, leading to the Spanish-American War.

Rusting, graffiti-covered tanks litter the beach of this island, once used by the U.S. military for target practice.

The crumbling remnants of this 19th-century quarantine hospital hint at the touristy island's darker past.

This enormous abandoned factory is now a makeshift graffiti gallery.

This abandoned neighborhood is now a park filled with beautiful trees, wildflowers, and hints of its past.

An abandoned Victorian-era mill in the middle of modern Manchester.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

A tiny town in an empty lot was the work of a local eight-year-old.

This railroad tunnel was once the longest in Massachusetts.

No one really knows how these old hobby horses got here, but the herd keeps growing.

A precariously balanced rock perches on the edge of a cliff created tens of thousands of years ago by glacial erosion.

A showcase of geologic history is home to one of the largest collection of lunar meteorites on Earth.

Tour the world's largest deep-hole dimension granite quarry, where you can view the plant where gravestones are made and roll a ball down the outdoor granite bowling alley.

Colorful clay cliffs tower over an unofficial nudist beach on Martha's Vineyard.