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
Lake Superior Railroad Museum Union Depot, now the Saint Louis County Heritage and Arts Center's Historic Union Depot. Listed on the National Register of Historic Places, the depot also houses the Duluth Art Institute, Duluth Playhouse, the Duluth-Superior Symphony Orchestra, and the Saint Louis County Historical Society. Lake Superior Railroad Museum The Lake Superior Railroad Museum is a railroad museum in Duluth, Minnesota, United States. The museum has seven steam, 14 diesel, and two electric locomotives; and more than 40 other pieces of rolling stock. The collection includes the "William Crooks", which became the first locomotive to operate in the state of Minnesota in