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

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

The mystic whose incorrupt corpse still attracts the faithful.

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

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

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

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

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

One of the most important yet well-hidden museums dedicated to the history of medicine.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

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.

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

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

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

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

One of seven Jewish catacombs in Rome and one of only two open to the public.

The Pope’s secret escape route.

The martyr's wax-enhanced skeletal remains lie preserved in a glass case in the Santa Maria della Vittoria in Rome.

A hospital where antique dolls are given new life.

A Nesting Doll of Churches.

This delightful little museum is dedicated to only one thing: pasta.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.