This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

Cave shrine on Monte Pellegrino.

Mysterious painted skulls in Moravia.

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

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

The resting place for anonymous victims of the Danube's dark waters.

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

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Macabre museum devoted to historical Viennese murders.

The final resting place for the remains of 143 Habsburg royalty.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

The beautiful baroque library of the Hapsburg empire.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

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

Two stunning 17th-century libraries and a cabinet of curiosities.

The giant skeleton sculpture is surprisingly well-traveled.

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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