This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

A burial vault located under Tiber Island in the middle of the Italian capital.

This curious, round temple is the oldest still-standing marble building in Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

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

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

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

One of the most important yet well-hidden museums dedicated to the history of medicine.

The Pope’s secret escape route.

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

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

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

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.

The final resting place of the poets Shelley and Keats.

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

The underground sanctuary of a mysterious ancient cult.

Rome is now home to a stunning food museum and library.

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

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