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

Massive galleon from a box-office bomb docked in Genoa.

This Italian ski resort rose to fame when Benito Mussolini was held prisoner there and then rescued by the SS.

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

This enormous sinkhole hides a secret world created from divine wrath.

A schoolhouse and chapel are all that remains of this alpine village.

Host to the annual Festival of the Snakes.

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

This constantly evolving art space saved an Italian town from its own crippling reputation.

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

The oldest scientifically dated tree in Europe lives on a remote cliff.

Was this cave created by Hercules's wrath, the devil, or volcanic activity?

A wood-and-steel sculpture garden featuring an artful interplay of nature and machinery.

The marshy karst plain has reclaimed this beautiful 17th-century church.

The world's largest "Christmas tree" is illuminated by hundreds of lights stretching 2,000 feet up the slope of Mount Ingino.

This medieval mountain town is also known as the "Village of Streams."

A rococo room covered entirely in porcelain originally constructed for another royal residence.

This small but lovely sinkhole lake is the last remnant of a great prehistoric water basin.

The only substantial part of Nazi Germany's formidable defensive line through Northern Italy that survives today, largely intact.

Things seem to roll, flow and run uphill on this short patch of road near Ariccia, Italy.

An ancient rogue artist community hidden next to one of the world's most glitzy and glamorous cities.

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

A medieval Italian village is fighting depopulation with this vibrant annual street art festival.

The pristine waters crossing this forest form a hidden waterfall among the dense vegetation.