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

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

A brutalist gem towering over the heart of Milan.

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

A massive bridge forms part of an aqueduct that was deemed an architectural wonder of its time.

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

A room filled with frescos that make it seem like the walls are crumbling down while giants die in despair.

A massive mausoleum towers over the gravestones in a 19th-century Italian "model village."

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

A sculpture serving as an homage to Pope John Paul II.

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

A map of Italy made entirely of trees.

Featuring the last fully walkable parapet walkway in Europe.

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

Leveled by an earthquake, this Italian village is now preserved as a massive concrete art project.

A medieval stronghold rising over the ruins of ancient Roman villas along Rome's southern coast.

These pools have been abandoned for over 20 years.

Abandoned village in Sicily built during the agricultural reforms of Mussolini.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

A cherry tree growing atop a mulberry tree.

Take a giant yellow bird cage to the top of Elba's highest mountain.

One Italian taxi driver covered his entire house in small seashells creating a weird bit of architecture that is preserved to this day.

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