The iconic 630-foot Gateway Arch stands as America's tallest monument and St. Louis's most recognizable landmark. Completed in 1965, this stunning stainless steel arch symbolizes the westward expansion of the United States. Route 66 travelers can ride to the top for breathtaking views of the Mississippi River and downtown St. Louis. The surrounding Gateway Arch National Park offers museums, riverfront walks, and interpretive exhibits about westward migration and the role of St. Louis as the 'Gateway to the West.'