This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

Jesus' footprints and the first catacombs in the world.

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

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

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

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

The largest and most famous wax anatomical collection anywhere in the world.

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

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

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

The underground sanctuary of a mysterious ancient cult.

The middle finger of modernity.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Venice's "Island of the Mad."

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

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