Mobsters came for a soak in the hot springs, and stayed for the illegal gambling and bootlegging.

An underground spring in a labyrinthine cave system, decorated with stalagmites and stalactites.

Mysterious face-like images that appeared within an Andalusian house are surrounded by legends of the paranormal.

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

You've probably seen these distinctive orange-tiled columns on the big screen.

Vintage furniture and art share space with all manner of collectibles at this quirky shop in Bangkok.

Hundreds of large Russian nesting dolls decorate this square, and the largest is a functioning hotel.

Dedicated to one of Spain’s most talented painters and also one of the least known.

A golden egg-shaped sauna in the Arctic tundra.

A mysterious burial crypt that was rediscovered inside a cathedral in Velha Goa.

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

The largest hydroelectric project in Laos created this eerie landscape.

Spectacular mineral formations fill these caves, which have been used for everything from smoking meat to stashing illicit liquor.

This Welsh dockyard was the site of the not-so-secret construction of the Millennium Falcon for the original Star Wars trilogy.

A sculpture for the sun and stars, created by Nancy Holt.

A seaside cemetery honors the Commonwealth soldiers and sailors that died in Sierra Leone during World War I and II.

A forest of immensely tall and unusually straight oak trees planted nearly 200 years ago to build naval ships that never came to be.

Even though bison are not native to this Danish island, you might find them walking around the Almindingen Forestas as part of a nature experiment.

This millennium-old site reflects a time when sugar was a treasured commodity.

A museum dedicated to the history of sugar cultivation on Réunion island.

This massive subterranean fissure is known as the "underground Grand Canyon."

This garage is frozen in the late 1990s, full of rare and untouched cars and motorcycles.

This arcade is one of the last places to catch a public performance by the now-defunct ShowBiz Pizza's house band of animatronic animals.

This 20th-century replica of a 13th-century castle has itself fallen into ruin.