This small chapel is built of human bones and decorated with a golden skeleton.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

An ancient ossuary in Rouen.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

Thousands of well-dressed mummies below a monastery.

The mortal remains of an estimated 70,000 people lie in the basement of a monastery in Lima, Peru.

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

The remains of 40,000 humans, meticulously stacked in a tiny churchyard shed.

One of the largest ossuaries in Spain is packed from floor to ceiling with bones.

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

This German bone house contains the remains of some 20,000 souls.

A house of bones — but nobody is quite sure to whom they belong.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

In a small churchyard in Dingolfing, Germany the quaint Schusterkapelle is there to remind you of your imminent mortality.

The mystery of the Putim Ossuary involves a tricorn hat.

An Austrian house of bones filled with hundreds of intricately painted skulls.

Structure built from the skulls of vanquished foes.

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

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

This massive library holds what was once the largest book collection in the world.

A surrealist timepiece by the artist of melting clocks.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.