Geometry and mystery come together in an epic show of octagonal masonry.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

A fairytale-like medieval church perched atop a rocky cliff on Italy's "Coast of the Gods."

This magical-looking island is notorious for the misfortunes suffered by its owners.

The bomb-ravaged remains of of a colossal Neptune.

A star-shaped fortress town fort built in the geometric model of the Renaissance utopian city.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

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

Italian cave with exceptional acoustics and an unsavory history.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

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

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

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

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

The location of the last witch trials of Italy, known as "The Salem of Europe."

This sword isn't waiting for a king to pull it out. It was placed there by a saint.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

Abandoned medieval hill town.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

Ruins of a 10th century church tucked away deep in a botanical garden.