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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

An exquisite tunnel of cascading flowers.

On Japan's Tashirojima Island, cats are king.

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

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

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

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

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

A terrific purveyor of natural history objects and curios.

Started as a kitchen garden, now the second largest botanical garden in the world.

Twelve natural mummies are displayed in the crypt of this former monastery school.

Visiting this cacophonous collection of vintage novelties is like stepping into the mind of a crazed toymaker.

Part bookstore, part café, and part forest.

Superstitious? Discover the witchy side of Mexico through its largest esoteric market.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

The studio of Catalonia's most famous theatrical designer remains exactly as he left it.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

Turntable anonymously received orphans, alms, and groceries.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Week-long block party becomes a competition for the best decorated street.

Hidden above a drug store on a nondescript corner of Lincoln Heights is a private clubhouse for intrepid explorers.

This star-studded Old Hollywood restaurant is where fettuccine Alfredo made its United States debut.