Halfway down the mighty Mississippi, a model of engineering greets the world to the Gateway to the West, St. Louis Missouri. The Gateway Arch is known worldwide; it's probably only second to the Statue of Liberty But how much do you actually know about its history? It's wild, and it parallels much of the 20th century.

Today on America's National Parks, Gateway Arch National Park, and its namesake architectural wonder that is like no other on earth.