Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

An abandoned skate park located in the middle of the wilderness.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

This nearly abandoned town was once a thriving mining community until a series of fires.

The oldest remaining authentic Putt-Putt course that Donald Clayton created in Ohio.

A crumbling mountain resort that looks like it was abandoned in an instant.

Natural time capsule containing an alien ecosystem.

The world's biggest version of the popular Swedish souvenir.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

The remains of one of the last mining camps developed on the New River.

A barbarous band of serpents guard the bases of these Aztec temples.

A semi-abandoned village destroyed by U.S. bombings during World War II dominates the valley of Turano.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

A hidey-hole sandwiched between cellphone, DVD, and jewelry stores features Tibetan delights.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

A 12th-century church with a medieval fresco and an intriguing “Greek runestone.”

The fading, forgotten remains of a once bright and booming factory.

This Central New York ghost town was once a prosperous railroad community.

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

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

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

An abandoned suspension bridge on the Falkland Islands is crumbling into the water.

A cozy bookstore is tucked within an old gold mine shaft beneath the cafe and ice cream shop.