Fort Gibson Historic Site: Founded in 1824 and the most western permanent post, and includes visitor information.Museum of the Great Plains: Features indoor and outdoor exhibits that include Red River Trading Post, the original Blue Beaver schoolhouse and Elgin Depot, and a Frisco steam locomotive located at Lawton.The Harn Homestead: Features a historic home, barn and grounds located on 9.4 acres, including news, history, and tour information located at Oklahoma City.