Gateway Arch

A 630-foot (192 m) stainless steel arch in St. Louis, Missouri, built as a monument to the westward expansion of the United States. It is the world’s tallest arch.

The Gateway Arch is a 630-foot (192 m) monument in St. Louis, Missouri. Clad in stainless steel and built in the form of a weighted catenary arch, it is the world’s tallest arch and Missouri’s tallest accessible structure. It stands on the west bank of the Mississippi River, at the site where St. Louis was founded in 1764.

Built as a monument to the westward expansion of the United States and commonly called "The Gateway to the West", the Arch is a National Historic Landmark in Gateway Arch National Park. It was designed by the Finnish-American architect Eero Saarinen in 1947, built from February 12, 1963, to October 28, 1965, and opened to the public on June 10, 1967.