An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

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

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

Fortified medieval tower house with lovely roof garden.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A fake medieval village in the middle of Turin.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

A lover's walk between hilltop towns, decorated with graffiti love notes.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

Italian cave with exceptional acoustics and an unsavory history.

A stunning cemetery famous for its extraordinarily delicate & lifelike mourning sculptures.

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

The bomb-ravaged remains of of a colossal Neptune.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Erotic art covers the walls of the largest ancient pleasure palace.

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

Bell tower juts out from a village buried under a lake.

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

A sunken idol welcomes parishioners to Davy Jones' Locker.

Five candy-colored villages on the Italian Riviera.