Caligula's colossal pleasure ships, discovered by Mussolini only to be lost in flames.

This ancient trail climbs the mountain where a Latin League cult worshipped Jupiter, its main deity.

The ruins of a thousand-year-old hermitage are tucked away deep in the sloping forests of Albano Lake.

This abandoned Brutalist treehouse is a hidden architectural relic.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

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

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

According to local folklore, this Roman sepulcher was once a throne for the Devil.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

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

Jesus' footprints and the first catacombs in the world.

Hidden beneath the famous St. Peter's Basilica is a veritable city of the dead that may hold the remains of St. Peter himself.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

Breathtaking and huge 430 year old maps of Italy.

Known for centuries as the famous Roman emperor's burial place, this monument is actually something else.

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

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

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

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

Rome's ancient Etruscan rival, now a park full of ruins.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

The final resting place of the poets Shelley and Keats.

One of the most important yet well-hidden museums dedicated to the history of medicine.

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