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

Breathtaking and huge 430 year old maps of Italy.

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

The filming location of a shark attack in Steven Spielberg's famous shark movie.

The only subway station in the city that still makes use of gap fillers.

A crumbling hospital from the 1850s on Roosevelt Island.

One of only two commuter aerial tramways in the United States.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

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

Mural fragments and various sculptures honor the longtime artist.

This candy-colored storybook village originated as a 19th-century Methodist campground.

The oldest platform carousel built in the United States continues to delight children in Martha’s Vineyard.

The home of the first American-born saint is one of the only curved buildings in New York.

The last living thing to come out of the rubble after 9/11 is now a symbol of hope and resilience.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

One of Jeff Koons’s largest sculptures and his first commemorative work.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.