Remnants of cone-shaped fascist bomb shelters in Milan.

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

The secret medieval communication system will whisk your words above the noise of the crowd.

Ancient cave tombs known as the "houses of fairies."

Da Vinci's equestrian statue, 500 years in the making.

The mark of the Devil's horns on a marble column in Milan.

Largest necropolis in the Mediterranean.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

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

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Southern Italy's spinning top village.

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

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

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

Walk through a fairytale in Tuscany.

2300-year-old Roman road connecting the empire.

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

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.