This lesser-known leaning tower is all that remains of the medieval castle of Vernazzano.

An abandoned village that resides along the mountains of the Aosta Valley.

A 17th-century doorway in a small Sabine village is a portal into the mysteries of alchemy.

A monk spent 14 years carving steps through tuff to make this religious site more accessible to pilgrims.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

This medieval castle was home to a known tyrant and features several hidden passages.

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

The hermit's humble home is hidden near the forested peak of Monte Marrone.

An unusual resting place built into the hill with an amazing view of Lake Como.

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

The ruins of this Roman temple dominate the small city in southern Lazio.

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

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

A single column facing the sea is all that's left of one of the most important temples of Magna Graecia.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

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

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

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

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

This unusually shaped fortress houses a blend of centuries-old frescoes and modern art.

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

A forgotten "city of water" underneath the famous Trevi district.

A lonesome Moai stands in a small Italian town some 9,000 miles away from its Easter Island brethren.