Completed in October 1965, the Gateway Arch cost less than $15 million to build. With foundations sunk 60 feet into the ground, its frame of stressed stainless steel is built to withstand both earthquakes and high winds. An internal tram system takes visitors to the top, where on a clear day they can see up to 30 miles across the winding Mississippi and to the Great Plains to the west. In addition to the Gateway Arch, the Jefferson Expansion Memorial includes the Museum of Westward Expansion and the Old Courthouse of St. Louis, where two of the famous Dred Scott slavery cases were heard in the 1860s.

Today, some 4 million people visit the park each year to wander its nearly 100 acres, soak up some history and take in the breathtaking views from Saarinen’s gleaming arch.