Omaha is the largest city in Nebraska, a river city on the Missouri River with a historic market district and a world class zoo. The Old Market Entertainment District preserves brick streets, warehouses, and galleries in downtown Omaha, the Henry Doorly Zoo and Aquarium draws families, and the Bob Kerrey Pedestrian Bridge spans the Missouri River to Council Bluffs, Iowa. The Durham Museum, in a restored Art Deco train station, tells the history of Omaha and the West, and the Joslyn Art Museum shows European and American art.