The Jefferson National Expansion Memorial, now known as Gateway Arch National Park, stands as a symbol of the United States' westward expansion. It features the iconic Gateway Arch, a 630-foot monument that is the tallest of its kind in the U.S. The park also includes the Old Courthouse, where Dred and Harriet Scott sued for their freedom, and the Museum of Westward Expansion, which showcases artifacts from the Lewis and Clark Expedition. This historic site not only commemorates President Jefferson's vision but also serves as a reminder of the diverse cultural groups that have shaped the nation's history.