The Gateway Arch in Gateway Arch National Park on the west bank of the Mississippi River in St. Louis, Missouri, USA. The image is captured from the east bank and shows the Old Courthouse through the arch. The 190m-tall arch was built as a monument to the westward expansion of the United States and is sometimes referred to as The Gateway to the West. The monument, built between 1963 and 1965, is clad in stainless steel and built in the form of a weighted catenary arch.