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

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

The mystic whose incorrupt corpse still attracts the faithful.

Rome's ancient Etruscan rival, now a park full of ruins.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

A forgotten "city of water" underneath the famous Trevi district.

This large, circular tomb is the final resting place of the first emperor of Rome.

One of seven Jewish catacombs in Rome and one of only two open to the public.

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.

The Pope’s secret escape route.

A hospital where antique dolls are given new life.

A Nesting Doll of Churches.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

A collection of objects supposedly singed by the hands of souls in purgatory.

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

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

Jesus' footprints and the first catacombs in the world.

A fairy tale castle in modern Rome.

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