This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

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

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

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

The Pope’s secret escape route.

Architectureal fantasy quarter of Rome.

A fairy tale castle in modern Rome.

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

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

A deep mark on the remains of a Roman temple, believed to be left by a legendary warrior.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

Breathtaking and huge 430 year old maps of Italy.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

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

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

This is the oldest Roman-made bridge in the city still existing in its original state.

This Italian foot path winds through the mountains via 52 individual tunnels.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.