This lake was sacred to the Sabine people who constructed a temple here on a floating island.

The hilltop ruins of a border fortification in the Italian Alps that was much fought over.

This site marks the oldest known settlement in Campania, inhabited around 9,000 years ago.

The first Italian factory to produce locomotives is now a marvelous museum.

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

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

Before the more famous Royal Palace of Caserta, the king of Naples first commissioned this overlooked residence.

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

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

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

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

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

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

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

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

According to the legend, this structure was built in a single night with the help of the devil.

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

This clifftop arch is a natural stunner.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The relics of dozens of martyrs are stored in a single chapel.

This medieval city gate is now a blend of the past and the modern world.

Italy's "New Mountain" rose from the ground in a volcanic eruption in 1538.

San Gennaro, the patron saint of Naples, greets pedestrians between these narrow city streets.

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