This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

A taste of the macabre Tokyo's ritzy shopping district.

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

Abandoned railway line circling the city of Paris.

A haunting collection of the vanished and disappearing natural world.

A museum of carnival attractions where you are invited to ride the rides.

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

A magical sinkhole on the Yucatán Peninsula is adorned with mini waterfalls and hanging vines.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

Cave where bat-eating snakes hang down from the ceiling.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

These azure waters were thought to lead to the Mayan Underworld.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

Beautiful public park off the beaten path and away from tourists.

Cat art as far as the eye can see.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Thirteen sculptures in central Moscow graphically depicting vices of the modern world.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

A beach made of semi-precious green sand on the Big Island of Hawai'i.

Order scoops of pandan, lychee, and black sesame at this family-run institution.