The anatomical-pathological collection of a man who changed surgery.

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

Two monstrous faces loom over a village in Czechia.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

An antique curios dealer and hybrid taxidermist.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

Saintly bones pressed into a wax effigy of a Catholic superstar.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This museum houses an imposing skeleton army comprised of creatures great and small.

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

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

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

Statue of death tucked in the University of Medicine courtyard.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

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

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

One of Ireland's most infamous prisons for rebels including men, women and children.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A 18th century graveyard and its astonishing cortege of macabre iconography.