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

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

In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

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

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

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

Roman-era ships unearthed...

Ancient ruins hidden underneath a modern luxury hotel.

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Rome's ancient Etruscan rival, now a park full of ruins.

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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

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

A huge enchanting public park just outside the ancient walls of Rome.

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

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

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

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

A hospital where antique dolls are given new life.

A Nesting Doll of Churches.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.