Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

A small cell adjacent to this church was once the bedroom for a renowned saint.

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

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

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.

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

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

This ancient Roman arch misled treasure hunters for centuries.

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

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

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

Roman-style pizza al taglio arrives here with magnificent, crackly crust.

An enigmatic modern marker left next to a historic Roman site.

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

This medieval church in Rome was almost destroyed following a terrorist attack in 1993.

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

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

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

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

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

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

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

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