The ruins of a medieval monastery named after a type of tree.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

Traveling this mountain pass reveals quaint stone buildings, stunning Irish scenery, and a bridge said to grant wishes.

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

A Roman temple perched over an Italian town, forgotten several times over.

Also known as "Hell Alley," this tiny street in Imola gained its name in a bloody episode in the 16th-century.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

This network of roads is one of the most unique Etruscan creations ever discovered.

Destroyed numerous times, this centuries-old bridge has always been rebuilt with its original design.

Claude Monet immortalized this medieval bridge in two of his paintings.

Italian director Pier Paolo Pasolini fell in love with this lonely 13th-century tower while making his most famous film.

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

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

This Roman underground canal was the longest tunnel ever built until the late 19th-century.

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

A long-buried ancient ruin unearthed right in the middle of the city.

According to the legend, this structure was built in a single night with the help of the devil.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

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

Also known as the Temple of Poseidon, this is one of the best-preserved Greek temples in the world.

One of Rome's most picturesque and original bridges was also a popular choice for Grand Tour artists.

An abandoned village, frozen in time by the threat of a landslide.

A colossal aqueduct from the second century B.C., deeply hidden in a gorge on the outskirts of Rome.

A 2,000-year-old engineering wonder hides beneath an Italian town.