A rare example of an octagonal Catholic church.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

When a massive landslide hit one of the world's tallest dams it created a tragic environmental disaster.

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

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A massive natural rock arch gives the Tuscan mountain its own window to the sky.

Ernest Hemingway was the first to sign this colorful wall covered in thousands of celebrity signatures.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The Bourbon royal family had this unique octagonal hunting "cottage" built on a tiny islet in Lake Fusaro.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

A sinister pyramid in the Frari contains the heart of the famous neoclassical sculptor.

Once an ancient Roman bath, now a hotbed of geothermal energy and a hub for energetic innovations.

With its mine closed, this old village is starting to resemble a ghost town.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This deconsecrated church has seen many uses, from a tobacco storehouse to a cinema.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

Explore the quarry where the marble was sourced for Michaelangelo's David.

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