The Museum of Westward Expansion is located beneath the iconic Gateway Arch in St. Louis, Missouri. It focuses on the history and impact of the westward movement in the United States, showcasing artifacts, exhibits, and multimedia presentations that illustrate the experiences of pioneers, Native Americans, and settlers. Visitors can explore various themes, including the Lewis and Clark Expedition, the Oregon Trail, and the role of the Mississippi River in westward expansion. The museum aims to educate the public about the complexities of this period, highlighting both the achievements and challenges faced by those who ventured into the American frontier.