The video game-themed street art first popped up in the French city.

The remains of the medieval wall that once surrounded Paris with ties to the construction of the Louvre.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

This place bears witness to the loss of many lives during WWII, and stands in stark contrast to the American Cemetery.

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

This symbol of the French Revolution still stands where it was first planted during the 18th-century.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

Coins and medals straight from the mint await visitors to this shop in the nation's capital.

This unassuming passageway played a key role in one of the most important events in U.S. history.

Experience life in one of America’s smallest neighborhoods.

This downtown Dallas art installation is always on the lookout.

The man who wasn't there.

A semi-scholarly approach to sex.

This subterranean oyster house has been the pearl of Grand Central Station since 1913.

A former copper mine which became a truly unsuccessful prison.

This lovely hilltop tower was specifically built to withstand 100 MPH winds.

Couple's personal collection of pinball machines turned public pinball museum.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

Neal Cassady may still have an open tab at one of Denver’s oldest watering holes.

A downtown park built on top of unclaimed graves.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.