Bacteria and algae give the salty water its bubblegum hue.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

A fairy tale castle in modern Rome.

Architectureal fantasy quarter of Rome.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

This large, circular tomb is the final resting place of the first emperor of Rome.

The underground sanctuary of a mysterious ancient cult.

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

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

A lavish 16th-century mansion filled with spectacular staircases, fantastic frescoes, and gorgeous gardens.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

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

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

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

Moorish signal station on a stratgic rocky outcrop.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

The defensive tower was built centuries ago to warn locals of Berber pirate attacks.