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

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

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

A 15th-century monumental Latin inscription on this house celebrates Lorenzo Manilio's love for Rome.

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

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A hospital where antique dolls are given new life.

The world's most active stratovolcano is almost always erupting.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

Italian cave with exceptional acoustics and an unsavory history.

142 ceramic steps become a mosaic once a year.

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

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

A madman's personal garden filled with 1,000 sculpted heads.

This amazingly preserved Doric temple was abandoned before it was ever completed.

These ruins of a Phoenician sanctuary in Sicily have a dark history.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

Haunting graffiti left by prisoners of the Spanish Inquisition.

This uncanny fresco celebrating the "triumph of death" was split into four pieces to be moved to another museum.

Every inch of this chapel is covered in craftsmanship from across the world.