The fairy tale castle of the "fairy-tale king."

A massive underwater sinkhole made famous by Jacques Cousteau.

Medicinal spa created with the discharge from a geothermal energy plant.

World's largest collection of serial killer artwork and other macabre exhibits.

A toxic ghost town sitting atop a massive coal fire.

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

The sign at the garden gate reads: "These Plants Can Kill."

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

A magical place that lets you play in and explore the world of Studio Ghibli.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

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

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

A submerged archeological park still holds the wonders of a Roman Sodom.

Beijing's version of Disneyland, completely abandoned, mostly destroyed.

South Korea's women of the sea have completely flipped their society's structure by becoming revered fisherwomen.

The abandoned hospital whose elaborate ghost stories cover up the dirty truth - an uneventful sanitation issue and other mundane reasons for its demise.

Secret North Korean passage discovered below the world's most dangerous border.

"Would you like your sangria in an IV bag, or straight-up?"

If you've ever wanted to tear Hello Kitty apart with your teeth, this is the place.

A son-and-daughter meat market, hawked by mom and dad.

Ming Dynasty necropolis raided during the Cultural Revolution.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.