Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An eerie, derelict amusement park in Berlin.

According to the legend, this structure was built in a single night with the help of the devil.

Beautiful views and Roman-style statues on the Italian coast.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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