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

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

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

A massive marble foot is tucked away in a small alley near the Pantheon.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Plaques on its facade commemorate the Tiber's most destructive deluges.

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

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

A rare example of a medieval house in Rome adorned with a melancholic inscription.

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

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

A square-domed symbol of resilience in the heart of the old Jewish Ghetto.

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

These hut foundations are believed to be the residence of Romulus, founder of Rome.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

An ancient Roman temple first dedicated to an emperor's wife is now a church.

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

Romans decided this 16th-century "talking statue" was so ugly, they named it after a primate.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

A modern sliver of architecture in Roma.

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