The world's longest known cave system.

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

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Oh, just a motel on the edge of the desert decorated with thousands of clowns conveniently located next to an abandoned graveyard.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A mysterious castle built as a monument to lost love.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A beautiful geyser under environmental threat.

Explore 10 acres of environmental sculptures.

A heavenly experience, right here on Terra Firma.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

The site of the climactic scene from the classic horror film is now a historic landmark.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

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

Resting place of Hollywood's immortals is also site of summer film screenings.

Stroll through a wonderland of stupendous moss-covered trees.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

Hollowed out cedar log tubs set in an ancient towering forest.

America's most famous piece of self-built architecture.