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, South Shore and Atlantic Railway Duluth, South Shore and Atlantic Railway The Duluth, South Shore and Atlantic Railway (DSS&A) was an American railroad serving the Upper Peninsula of Michigan and the Lake Superior shoreline of Wisconsin. It provided service from Sault Ste. Marie, Michigan, and St. Ignace, Michigan, westward through Marquette, Michigan to Superior, Wisconsin, and Duluth, Minnesota. A branchline stretched northward from Nestoria, Michigan up to the Keweenaw Peninsula and terminating at Houghton, Michigan, with two branches extending further to Calumet, Michigan and Lake Linden, Michigan. The first predecessor of the DSS&A began operations in 1855. The railroad fell under the control of the