Structure built from the skulls of vanquished foes.

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

A huge museum of much more than just agriculture displayed in a princess's palace.

The largest medical and anatomical collection in France lies hidden from the public.

This former insane asylum now holds a pathological anatomy museum.

Wax models of disease and deformity are on display at this German medical museum.

Medical history with an amazing, if frighting, collection of wax diseases on display.

Weird wax anatomical models reside here, as do other anatomical specimens.

This French anatomy museum greets guests with a skinless man, mid-shovel.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

One of the best collections of wax anatomical models in the world.

A museum in the childhood house of a medical pioneer.

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

Historic psychiatric asylum and most-filmed location in the Great White North.

The decaying ruins of Wales' first asylum for the mentally ill.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

The abandoned hospital whose elaborate ghost stories cover up the dirty truth - an uneventful sanitation issue and other mundane reasons for its demise.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

This woodland architectural installation acts as a camera obscura for the heavens.

The Bristol Camera Obscura housed in an ancient windmill.

360° views of the city plus five floors of optical illusions and hands-on science.

A large camera obscura, constructed entirely from digitally fabricated components.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.