This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

This poignant art installation raises awareness of violence against women.

Nestled in the heart of Milan is a real wunderkammer of morbid curiosities.

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

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

An ancient artistic garden parlor full of hidden water wonders.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

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

The final resting place of the poets Shelley and Keats.

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

An abandoned Roman salami factory has found new life as an art space home to 200 squatters.

2300-year-old Roman road connecting the empire.

This Italian stadium makes liberal use of fascist statuary to evoke classical sporting arenas.

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

This abandoned Brutalist treehouse is a hidden architectural relic.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

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

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A submerged archeological park still holds the wonders of a Roman Sodom.