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.

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

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

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

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

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

This hydrochronometer was invented by a Dominican monk and is a prime feature in this garden.

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

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

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

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

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

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

A fortified medieval basilica on the Caelian Hill preserves extraordinary frescoes and one of Rome's most beautiful hidden cloisters.

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

Its interior is adorned with some of the best examples of early Christian mosaics.

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

Remnants of a 4th-century church with vivid medieval frescoes and ancient sarcophagi hide beneath this old basilica.

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

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

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

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.

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