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
Gunflint and Lake Superior Railroad Gunflint and Lake Superior Railroad The Gunflint and Lake Superior Railroad (G&LS) is a defunct Minnesota logging railroad that operated in the Thunder Bay District of northwestern Ontario and in Cook County of northeastern Minnesota. The G&LS was built in 1902 by the Pigeon River Lumber Company to harvest primarily white pine and norway pine from the eastern side of Gunflint Lake. The logs were then transported to the company's sawmill in Port Arthur to be processed. The line originated at the Canadian Northern Railway-Duluth Extension (PAD&W Railway) at Little Gunflint Lake, crossed the Canada–United States border, travelled along the