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

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

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

Ancient ruins hidden underneath a modern luxury hotel.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

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

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

Inside this building is another country within Rome, a sovereign entity without a physical territory.

If you ever wanted to touch a medieval mercenary’s three testicles, look no further.

See what remains of a once grand ancient Roman circus.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

Saint Borromeo often prayed in this austere crypt during the 16th century.

Third time's a charm, or in this case, two testicles are.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Before there were doorbells this bronze ear was installed for visitors to announce their arrival.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.

The city of Parma's cathedral is home to one of the greatest illusionistic frescoes of the Renaissance.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

A striking memorial recalls thousands of Bolognese men and women killed fighting fascists in World War II.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.