A church of bones, decorated with 40,000 human skeletons.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

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

Hot springs monkey spa in the middle of Hell's Valley.

The world's only museum devoted to the wonders of fluorescence.

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

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

A psychedelic labyrinth on the San Francisco bay.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

A terrific purveyor of natural history objects and curios.

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

One of the most easily accessible examples of the rare 1960s UFO houses.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

A kaleidoscopic warehouse-maze of handmade neon signs.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."