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, Minnesota of East Dubuque). Highway 61 and parts of Highways 2 and 53 are segments of the Lake Superior Circle Tour route that follows Lake Superior through Minnesota, Ontario, Michigan, and Wisconsin. Duluth International Airport serves the city and surrounding region with daily flights to Minneapolis and Chicago. Nearby municipal airports are Duluth Sky Harbor on Minnesota Point and the Richard I. Bong Airport in Superior. Both the Bong Airport and Bong Bridge are named for famed World War II pilot and highest-scoring American World War II air ace Major Richard Ira "Dick" Bong, a native of nearby Poplar, Wisconsin. Located