This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

Anatomical cabinet holds unexpected treasures.

The naturally mummified body of a peasant girl saint.

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

One of the world's largest collections of pathological specimens.

This South London cemetery holds the remains of more than 15,000 people.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

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

The final resting place of soldiers' loyal canine companions.

Europe's second largest ossuary wasn't discovered until 2001.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A preserved 18th century steel factory.

Isaac Newton's former home, where the famous apple tree still stands.

When methane gas started seeping up from the ground, they picked up and moved the entire town.

Final resting place of a New Haven urban legend.

A marvel of Byzantine engineering under the streets of Istanbul.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

Continuing the tradition of the dime museum in style.

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

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

A macabre farm reserved part of its 222-acres for dead bodies, all in the name of science.