An Italian hillside ghost town.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Thousands of well-dressed mummies below a monastery.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The world's most active stratovolcano is almost always erupting.

Architectureal fantasy quarter of Rome.

Ever hear of the Milazzo Cage?

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

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The underground sanctuary of a mysterious ancient cult.

Nicknamed the "Museum of Horrors," this French anatomical collection has been fascinating visitors for over a century.