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

Ride a boat through this magnificent underground world, which now doubles as a theater.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

A popular legend claims that the famous pizza was invented at a restaurant in this alley.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A sulfuric hellscape in southern Italy.

One of the world's oldest working clocks is curiously missing the Zodiac sign of Libra.

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

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

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

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The walls and streets of the ancient city are peppered with penises.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

"The prettiest love letters in the world" ... or so said Lord Byron.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

Southern Italy's spinning top village.

This Italian dam is covered in salt-hungry goats who manage to scale its almost vertical face.

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

A young Italian couple has been locked in an embrace for over 6,000 years.

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

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

Italian cave with exceptional acoustics and an unsavory history.