A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

An abandoned monastery sits on a far-off island in the Adriatic Sea.

Windblown rock formations in an ancient Roman quarry.

Crushed coral and crystals give the sand its signature coloration.

Mysterious tombstones thought to be remnants of Atlantis.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

Greenery covers the face of a gently-dripping waterfall deep in the mountains of central Sardinia.

This cliff-face port is considered a masterpiece of mining engineering.

An eerie gravel road full of shards of red bricks leads to the ruins of a deserted factory.

The ruins of a thousand-year-old hermitage are tucked away deep in the sloping forests of Albano Lake.

Ruins of a 10th century church tucked away deep in a botanical garden.

A founding document of the European Union was written on an island where Roman emperors once banished women.

Built to be the ideal penitentiary, this abandoned panopticon saw several revolts and even a prisoners' coup.

These artificial caves crafted by ancient Romans were elaborate fish farms for moray eels.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

Once one of the largest sites of silver deposits in Italy.

Packed with geological formations, an ancient river, and taxidermied seals, this overlooked coastal cave system is worth a spelunk.

One of ancient Etruria's most spectacular archaeological sites with impressive necropolises and rugged landscape.

The second-highest village in Lazio has attracted artists for 400 years and is now a spectacular open-air art gallery.

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

An enormous sinkhole that local lore attributes to the anger of the Virgin Mary.

This serene, turquoise lake in an extraordinary nature reserve showcases a rare natural phenomenon.