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

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

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

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.

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.

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

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

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

A forgotten "city of water" underneath the famous Trevi district.

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

Railroad officials in the early 1900s sought to spare travelers the sight of Roman soldiers’ private parts.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

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

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

This statue is the only female representation of Rome's "talking statues."

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

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

A former Roman town that was once the home of Scipio Africanus.