A tunnel once abandoned now thrives with graffiti art as an off-limits makeshift gallery.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

The world's longest known cave system.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The atmospheric road was never meant to be so creepy.

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

Cabaret where the show girls are all androids, and the patrons couldn't be more pleased.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

A trash dump made beautiful by nature's power.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

These fantastically named natural pools look like something out of a Scottish myth.

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

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

A snapshot of the city's fascinating voodoo culture.

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.