The newly renovated St. Louis Mercantile Library is a historic gem on UMSL's North Campus, established in 1846 as the oldest library in continuous operation west of the Mississippi River. It offers unparalleled special collections including rare books, archives on westward expansion, railroads (largest in North America), river history, Civil War/presidential materials, and regional Missouri art. Recently revitalized through a 2025 renovation, it features an inviting new entrance with grand staircase, refreshed gallery spaces, and the new Wallace H. Smith Gallery of Art for rotating exhibitions of its extensive art holdings. Open to the public for research, events, and cultural exploration, a must-visit for history buffs, researchers, and anyone interested in St. Louis heritage.