The "Mona Lisa" of funerary art.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Templar knights fleeing persecution are said to have left this sword in stone as a landmark in 1307.

An unnatural lake in a naturally beautiful setting.

This fountain is dedicated to the workers who perished constructing the Fréjus Rail Tunnel.

All that's left of the quintessential "cabin in the woods."

These small, triangular, colorful houses are a staple of Madeira Island.

The stone that rocks no more.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

This seaside Italian village doesn't just look Escher-esque, it actually inspired the mind-bending artist.

A monument to the migrants who cross the dangerous waters between North Africa and a tiny Italian island.