Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

This gallery commissioned by Cardinal Spada is known for its magnificent optical illusion.

This curious, round temple is the oldest still-standing marble building in Rome.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A huge enchanting public park just outside the ancient walls of Rome.

The Pope’s secret escape route.

A fairy tale castle in modern Rome.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A dilapidated psychiatric facility on the outskirts of Milan where electroconvulsive therapy was developed and Napoleon once lived.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Two planes stand abandoned after the closure of an aircraft-themed restaurant.

This ultra-modern burial building would have stacked the dead like a giant filing cabinet.

An unusual house built using an iso-elastic membrane.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

A unique Tuscan hideaway acts as an art mecca as well as a hotel.

Nestled in the hills of Tuscany are gorgeous, multicolored hot springs.

An Italian vineyard invites religious pilgrims to stop by 24/7 to get their drink on, for free.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

Vast network of air raid tunnels beneath Lombardy's capital.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

Water and windows define this defensive Italian well.