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

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

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

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

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

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

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

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

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

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

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

Roman-era ships unearthed...

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

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

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

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

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

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

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

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.