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

A rather vulgar example of the transition from Latin to the Italian vernacular.

The former home of an Italian artist is now a shrine to his ambitious works.

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

This ancient Roman arch misled treasure hunters for centuries.

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

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

Rome's first modern graffito is all that is left of a peaceful protest from the 1970s.

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

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

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

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

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

The ruins of an abbey believed to have been founded by Charlemagne in the 9th century.

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

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

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

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

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

Roman-era ships unearthed...

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.

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