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 Maritime Visitor Center Lake Superior Maritime Visitor Center The Lake Superior Maritime Visitor Center is a museum in Duluth, Minnesota, operated by the United States Army Corps of Engineers. The museum is in Duluth's Canal Park near the Aerial Lift Bridge and overlooks the entrance to the Duluth-Superior harbor. The museum and grounds are all property of the U.S. federal government. All visitors are welcome to visit this museum without paying. Donations are accepted by the Lake Superior Marine Museum Association, and support general maintenance and upkeep of the building, new exhibit development and acquisition, and staffing. Exhibits demonstrate the history and operations