World's first "penitentiary," meant to be humane, drove men insane.

You might know it as the Overlook Hotel, but the inside is not going to be familiar.

A "haunted" landmark on the coast of Southern California.

A museum dedicated to exhibiting remarkable outsider art.

The largest puppetry museum in the United States houses the world's most complete collection of Jim Henson artifacts.

Once home to seven different roller coasters, Glen Echo has undergone many transformations since its founding in 1891.

A heavenly experience, right here on Terra Firma.

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

This historical air terminal in Houston is slowly becoming an aviation museum dedicated to the city's aeronautical history.

Less a museum than a bizarre fantasy world created by artists and engineers.

A monument to the art of slicing people open.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

A whimsical village of unique treehouses resides in a Washington forest.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

Two insane asylum bodies embalmed by an amateur.

This abandoned train tunnel has been the subject of countless ghost stories for years.

Two gems of Beaux Arts architecture that have been sitting vacant for years.

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

This haunted hotel built on natural springs once served as a hospital for a quack doctor promising a cure for cancer.

If there's another drive-through golf-cart bar in a bat-filled cave on top of a mountain, we don't know about it.

This abandoned amusement park was built on a site with a dark history.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.