This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Jesus' footprints and the first catacombs in the world.

Gods clash with machines in a power plant regenerated as a museum.

2300-year-old Roman road connecting the empire.

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

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This equestrian statue of Constantine the Great has been the subject of criticism for centuries.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

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

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The Pope’s secret escape route.

The mystic whose incorrupt corpse still attracts the faithful.

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

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

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

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

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

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

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

Charles Dickens was not a fan of the ghastly wall dressings in this 6th century church.

The underground sanctuary of a mysterious ancient cult.

A collection of objects supposedly singed by the hands of souls in purgatory.

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