Erotic art covers the walls of the largest ancient pleasure palace.

Medieval torture techniques with a modern conscience.

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

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

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

Go inside to really appreciate this 500-year-old technological masterpiece.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Venice's "Island of the Mad."

The oldest operating pharmacy in the world features 800-year-old recipes.

Thousands of well-dressed mummies below a monastery.

Pompeii's less famous neighbor is still revealing her secrets.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.