Duluth, Minnesota Lakes Waterway and the Saint Lawrence Seaway. Duluth forms a metropolitan area with neighboring Superior, Wisconsin, called the Twin Ports. The cities share the Duluth–Superior harbor and together are the Great Lakes' largest port, transporting coal, iron ore (taconite), and grain. A tourist destination for the Midwest, Duluth features the United States' only all-freshwater aquarium, the Great Lakes Aquarium; the Aerial Lift Bridge, which spans the Duluth Ship Canal into the Duluth–Superior Harbor; and Minnesota Point (known locally as Park Point), the world's longest freshwater baymouth bar, spanning . The city is also the starting point for vehicle trips along
Duluth, Minnesota reptiles, primates and barnyard animals. The zoo offers learning programs and regularly features special events. The Lake Superior Railroad Museum is in the old Duluth railroad station. It has seven steam, 14 diesel, and two electric locomotives, and over 40 other pieces of rolling stock. The collection includes the William Crooks, the first locomotive to operate in the state of Minnesota, and the Duluth, Missabe and Iron Range Railway Number 227, a "Yellowstone" locomotive that was among the largest steam engines ever. Only 18 Yellowstones were ever built, and Duluth exhibits one of the only three that remain. Minnesota sits