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 Zoo zoo until his death in 1968. Lake Superior Zoo The Lake Superior Zoo is an AZA-accredited zoo in Duluth, Minnesota. The mission of the Lake Superior Zoo is to provide close-up animal experiences which inspire connections to wildlife and action toward conservation in our region and around the world. The Lake Superior Zoo was founded in 1923 by a West Duluth businessman, Bert Onsgard, when he built a pen for his white tail deer "Billy". This helped his vision spread through the community who in turn helped him build the zoo. The Pittsburgh Steel Company donated a rail car of