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

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

This unassuming bridge is most likely one of Michelangelo's unfinished masterworks.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

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

Breathtaking and huge 430 year old maps of Italy.

Once the hottest nightclub in France, Amnesia now lies in ruins after a 2000 bombing.

A breathtakingly steep set of stairs is carved directly into the face of the sea cliffs of Bonifacio.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

Depending on how it is measured, this lighthouse can claim to be the tallest in Europe and the tallest conventional lighthouse in the world.

Massive galleon from a box-office bomb docked in Genoa.

The world's largest second-hand graces a clock surrounded by constantly changing flower beds. 

The lost Latin words were reconstructed using the holes from the nails that once pinned them in place.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

This ancient theater was once the home of fierce gladiatorial battles.

This mosque was based on Sub-Saharan Islamic architecture and created for the Senegalese Tirailleurs.

The ruins stand as a somber reminder of France’s worst civil catastrophe of the 20th century.

Avant garde house of Pierre Cardin on the Cote d’Azur.

A fortress on this island housed the mysterious prisoner known as the "Man in the Iron Mask" for more than a decade.

Claude Monet immortalized this medieval bridge in two of his paintings.

Every year, the town of Menton, France, turns lemons and oranges into giant sculptures depicting windmills, dragons, and more.