A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

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

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

A rococo room covered entirely in porcelain originally constructed for another royal residence.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

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

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

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

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

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

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

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

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

This museum located in Fondi is also said to be the most haunted building in town.

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

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

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

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

According to local folklore, this Roman sepulcher was once a throne for the Devil.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.