Round Tower at Fort Snelling in Minnesota. The tower, built around 1820, was originally intended as a defensive tower, but has since served as a guard house, wash house, coal storage building, ordnance storehouse, prison room, office, private home with a commercial beauty shop, and museum. This image is by Arthur Adams, Minneapolis high school teacher, local historian, and photographer. Adams traveled throughout Minnesota, taking photographs to augment his lectures. His studio was located at 3648 Lyndale Avenue South in Minneapolis.