Just across from the "Last Supper" painting is the famous painter's vineyard, a gift received for creating the masterpiece.

Where serial killer Aileen Wuornos drank her last beer.

Over 12,500 words are scrawled across each room of this historic plantation house and no one knows why.

A replica of one of the more than 15,000 civilian lookout towers that lined the U.S. coast during World War II.

The ruins of a once-thriving sugarcane plantation that was burned in the Second Seminole War.

Two men built this castle on the Florida coast as an artistic “landscape sculpture.”

Large Hadron Collider and the Birthplace of World Wide Web.

This statue of a Hindu cosmic dancer at CERN is a metaphor for modern physics.

An enigmatic modern marker left next to a historic Roman site.

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

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

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

Gods clash with machines in a power plant regenerated as a museum.

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

A forgotten "city of water" underneath the famous Trevi district.

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

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

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

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

The Pope’s secret escape route.

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

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

The final resting place of the poets Shelley and Keats.

The underground sanctuary of a mysterious ancient cult.