Venice's island of the dead.

An ancient artistic garden parlor full of hidden water wonders.

This picturesque Umbrian city has a subterranean side that has long remained hidden.

This Italian foot path winds through the mountains via 52 individual tunnels.

The world's most active stratovolcano is almost always erupting.

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

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

Romans built the world's tallest artificial waterfall in 271 BC.

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

This abandoned Brutalist treehouse is a hidden architectural relic.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

This medieval Italian town is a sheer (and beautiful) cliffside defense.

The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

Armenian monks at an island monastery in the Venetian Lagoon make a rare rose petal jam.

This Tuscan lake hides a 13th century town that is still visible when the water recedes.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

This ancient market is often referred to as the oldest shopping mall in the world.

Natural cathedral designed by Italian artist Giuliano Mauri.

This immaculate and historic water garden culminates in a massive stone dining table with an inset fountain for chilling the wine of the Cardinal's guests.

Eco-village hidden in the foothills of the Alps that created a massive system of psychedelic underground temples.

A fairytale island floats in the middle of Italy's little-known Lake Orta.

The secret medieval communication system will whisk your words above the noise of the crowd.