A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

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.

Venice's "Island of the Mad."

The plague quarantine island home to the alleged "Vampire of Venice."

One part local history, 99 parts gruesome haunted house.

The view that inspired the scenes of Dracula's first landing in England.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

The curious underground history of keeping Paris clean.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.