Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

One of the oldest still-working clocks in the world sits on an ancient tower.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

This site marks the oldest known settlement in Campania, inhabited around 9,000 years ago.

When occupying Nazi troops detonated a mine below, medieval frescoes were revealed in this small cliff-side hermitage.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

One of the four sanctuaries of Rieti's Holy Valley was the site of the first living nativity scene.

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

This massive rock balanced for thousands of years being tossed here during a volcanic eruption.

In this museum, visitors are invited to touch the art.

Unscathed for almost 2,000 years, the best preserved Roman triumphal arch is in a small southern Italian city.

After World War II, this former concentration camp in Northern Italy became a refuge for those displaced by the war.

This seventh-century fortification marked the western border of the Lombard duchy of Spoleto.

A small thermal park among the mountains of Southern Italy features a surprising piece of modern art.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Its look is severe, but its location, isolated on a hill in the middle of the countryside, is particularly scenic.

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

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

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

Nobles would stage mock naval battles on this large lake at the Royal Palace of Caserta.

The ruins of this once gorgeous medieval church are still standing, despite the region's constant flooding.

Just one of the Italian corridors vying for the title of the country's narrowest.

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