The Museum at the Gateway Arch is a modern and engaging museum located right at the base of the world-famous "Gateway to the West" arch in St. Louis, Missouri, USA. The arch itself is one of the most recognizable symbols of both the city and the entire country, and the museum beneath it offers a deep dive into the history of this iconic site.

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This museum is dedicated to key moments in American history, particularly the expansion into the American West. The exhibits explain how St. Louis became the "gateway" for pioneers and explorers moving westward, as well as the significance of the arch itself as a national monument symbolizing the spirit of discovery and expanding horizons.
As part of the Jefferson National Expansion Memorial, the museum occupies an impressive underground space. Here, visitors can learn about migration patterns, the rich culture of Native American peoples, the fascinating construction history of the Gateway Arch, and the role of St. Louis in the development of the United States.