An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

A Nesting Doll of Churches.

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

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

A fairy tale castle in modern Rome.

Architectural monsters are devouring this palace's every door and window.

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

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 underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

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

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

Architectureal fantasy quarter of Rome.

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

A former Roman town that was once the home of Scipio Africanus.

A special area of the National Archaeological Museum of Naples is located inside a metro station.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

A surreal botanical garden with an even more surreal tour guide.

Suffocating dogs was a common spectacle in the fumes of this noxious cave.

The relics of dozens of martyrs are stored in a single chapel.

A rococo room covered entirely in porcelain originally constructed for another royal residence.