A Wild West jailhouse that slid down the mountainside.

The abandoned ruins of a failed resort hide on this verdant, picture-perfect island.

This medieval hilltop village was abandoned at the end of the 19th century, after existing for more than 500 years.

Where condemned pirates met their grisly end at the gallows on the River Thames.

Arrr! The most authentic collection of pirate artifacts in the world... matey.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

Nature took her revenge on the "Wickedest City in the World."

The smallest port in France is named after the pirate who created it.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

These ruins have been linked to a sherbet factory that exploded, but the story may be entirely fictional.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

An eerie, derelict amusement park in Berlin.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Hidden in the hills is a mysterious stone structure, known only to a few.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

This ancient Bedfordshire church was abandoned when the village's population slowly began migrating to new towns.