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

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.

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

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

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

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

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

This ancient Roman arch misled treasure hunters for centuries.

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

An unremarkable wooden wheel built into the side of one of Rome's oldest hospitals was part of a policy to reduce infant exposure.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

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

A hospital where antique dolls are given new life.

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

One of South America's most exclusive resorts has a storied history dating back to World War II.

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

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

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

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