The underground sanctuary of a mysterious ancient cult.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An alchemist's "magic door" stands in the middle of a Roman park.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Once the largest factory complex in all of Europe, this converted shopping center celebrates its industrial past in a big way.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

Gorgeous views of Italian mountains and valleys form the backdrop of this unique open-air theater.

Haunting graffiti left by prisoners of the Spanish Inquisition.