London's largest outsider art museum.

A museum dedicated to exhibiting remarkable outsider art.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

An enchanting work of outsider art, full of whimsical sculptures and carvings.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

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

A mud statue stands in the dark tunnels, seeming to hold up the weight of the city above.

Skeletons, medical artifacts, and other obscure and precious treasures all displayed in a wooden pharmacist's cabinet.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

A unrivaled and rather horrifying collection of wax dermatological models.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

France's most famous cemetery, with some of its most curious tombs.

This massive subterranean fissure is known as the "underground Grand Canyon."

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

One of the most important yet well-hidden museums dedicated to the history of medicine.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

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

Artworks by loners, prisoners and the criminally insane.

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

Frida Kahlo's childhood home, now a museum of her life and works.

The famous artist couple lived and worked here, in two different houses separated by a bridge.

A Buddhist theme park brings you a Buddhist version of Hell.