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

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

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

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

A church filled with the bones of hundreds of virgins martyrs—or so they say.

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.

Ancient catacombs form the foundation for this Rococo orgy of a church.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Structure built from the skulls of vanquished foes.

An ancient ossuary in Rouen.

Artfully arranged bones of 5,800 Austrians.

The personal charnel house of Anton Bruckner.

Mysterious painted skulls in Moravia.

Thousands of well-dressed mummies below a monastery.

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

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

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

This Italian pyramid is said to hold the mingled remains of the dead from both sides of the Battle of Novara.

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.

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

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

This network of conjoined cellars was riddled with traps and supposedly allowed the townspeople to pretend their homes were deserted.