Mysterious tombstones thought to be remnants of Atlantis.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

This mysterious Sardinian festival sees a horde of blank-faced equestrians compete for tin stars.

Water and windows define this defensive Italian well.

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

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

Largest necropolis in the Mediterranean.

Roman-era ships unearthed...

A secret hatch containing two parchments was discovered in this statue over 40 years after its installation.

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

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

2300-year-old Roman road connecting the empire.

The Vatican's secret porn-festooned bathroom was painted in erotic murals by one of the greatest artists of the Renaissance.

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

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

This delightful little museum is dedicated to only one thing: pasta.

The Pope’s secret escape route.

Ever hear of the Milazzo Cage?

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.