Our Gateway Arch is a 630-foot (192 m) monument built in 1965. Clad in stainless steel and built in the form of an inverted, weighted catenary arch. It stands as the world’s tallest arch. It is also the tallest man-made monument in the western hemisphere and Missouri’s tallest accessible building. The Gateway Arch was built as a monument to the westward expansion of the United States.
Jefferson National Expansion Museum also offers riverboat rides from replica nineteenth-century paddle-wheel riverboats, the Becky Thatcher and the Tom Sawyer. They were brought to St. Louis in 1964 so spectators could get a close-up view of the Arch as it was being constructed, and are the only riverboats on the St. Louis Riverfront today.