This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

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

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

The curiosities and wonders of pharmacy in a delightful historic building.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

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

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The oldest stone house in Paris was built by its most famous alchemist.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

The final resting place to 300 Victorian-era pets hides inside the city park.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The anatomical-pathological collection of a man who changed surgery.

America's Most Wanted's set resides in this tribute to the history of crime and punishment.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A modern English garden of eccentric beasts, follies, and oddities.

The curious and tiny collection contains some very odd objects.

A hotel and restaurant serving as the mecca of kitsch.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

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