The first declared National Monument in the United States.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Continuing the tradition of the dime museum in style.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.

Famously misunderstood wonder of the ancient world

Staves, storm-calling, and of course, necropants.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

A toxic ghost town sitting atop a massive coal fire.

A fiery crater has been burning in the Karakum Desert since 1971.

A crumbling hospital from the 1850s on Roosevelt Island.

On the Oregon coast there is a natural hole that seems to be draining the sea.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

An emerald-green grotto just a short trip from Austin.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

On Japan's Tashirojima Island, cats are king.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The only structure left with direct ties to the Salem witchcraft trials of 1692.