Fort Lyon, first named Fort Wise, has served in Colorado as a United States Army fort, a sanatorium, a neuropsychiatry facility, and a minimum security prison. The state closed the prison in 2011, and in 2013 proposed to use the site as a rehabilitation center for homeless people. The fort is listed on the National Register of Historic Places. Part of the site, the Fort Lyon National Cemetery, which began burials in 1907, remains open.