(Iowa)
Fort Atkinson State Preserve is a state preserve of Iowa, USA, containing the remnants of Fort Atkinson, a U.S. Army frontier post created to keep the peace between various Native American tribes as well as prevent white settlers from encroaching on Indian lands. In February 2013 the fort was listed on the National Register of Historic Places as Fort Atkinson Historic District. (Ref: https://en.wikipedia.org/wiki/Fort_Atkinson_State_Preserve)