Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

These unique markers designate the route American forces took during the Liberation of France.

An effigy of a trapped paratrooper dangles from a Normandy church to commemorate one remarkable D-Day event.

Santa Monica is one of the world's longest, most beautiful, and least developed beaches: just white sand for miles, a single beach shack, and the concrete shell of an abandoned resort that never got past its foundations.

This 19th-century stone bridge in Mayenne was renamed after an American soldier who died defusing explosives placed under it, saving it from destruction during the town’s liberation in August 1944.

The words of the neighborhood's most famous poets adorn four concrete walls.

Legendary frontman of the Doors looms in this giant mural by famed Venice muralist, Rip Cronk.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

A second generation sun-powered marvel lights up the night.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A man's head is enshrined beneath a statue near the first building constructed for the modern Olympic Games.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

Legend says this sacred tree was a gift from goddess Athena.

An ancient octagonal weather station named for the eight Greek gods of wind.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

View the ancient remains of buildings and the ancient "River of Hades" before hopping on a train.

Where commuters walk through remnants of an ancient Greek necropolis.

Gustave Eiffel's masterpiece until the Eiffel Tower was built.

This Greek Orthodox church houses the mummified body of St. Spyridon.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.