Beside some power panels, a plaque celebrates the history of an alternate world.

This museum dedicated to an oft-overlooked support industry features a surprisingly moving brass diorama of a man being saved from a sinking car.

One-of-a-kind museum inside the first Boeing 747-400 ever made.

Mysterious library of an infamous financier and spiritual seeker.

The perfectly named cave drop is the deepest in the continental United States, almost matching the height of Seattle’s Space Needle.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

An enormous, inside-out glass globe built in 1935.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

On Japan's Tashirojima Island, cats are king.

A tiny, unassuming park in Tampa that belongs to the Republic of Cuba.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Stay in a room with a view... of the bottom of the ocean.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

Welcome to old Florida, where a 1940s mermaid show is still enchanting visitors.

A mysterious castle built as a monument to lost love.

This abstract roadside poultry was saved from demolition by outraged drivers and pilots.

The Battle of Atlanta in 360 degrees, featuring a corpse that bears a striking resemblance to Clark Gable.

These ancient ritual mounds are our best window into the culture of the ancient Mississippians.

This mysterious twin turboprop Grumman G-159 covered in graffiti has spent a decade and a half abandoned.