waterfront, boardwalk, Duluth, MN, Minnesota, Lake Superior, People walk on the boardwalk at Downtown Lakewalk along Lake Superior in Duluth.

waterfront, boardwalk, Duluth, MN, Minnesota, Lake Superior, People walk on the boardwalk at Downtown Lakewalk along Lake Superior in Duluth. Aerial Lift Bridge in the background.

carriage ride, Duluth, MN, Minnesota, Lake Superior, Horse-drawn carriage waits for passengers at Downtown Lakewalk along Lake Superior in Duluth.

Duluth, MN, Minnesota, Fond-Du-Luth Casino in downtown Duluth along Superior Street.

aerial lift bridge, Duluth, MN, Minnesota, Lake Superior, Canal Park, Aerial Lift Bridge spans the canal entrance to Duluth Harbor in Duluth.

bridge, lift bridge, Duluth, MN, Minnesota, Aerial Lift Bridge, 386 feet long, at sunrise spans the Duluth Harbor on Lake Superior in Duluth.

red warning buoy, Duluth, MN, Minnesota, Lake Superior, Woman looking out at Duluth Harbor and Aerial Lift Bridge on Lake Superior in Duluth.

Duluth, MN, Minnesota, William A. Irwin Ore Boat moored at the dock in Duluth Harbor on Lake Superior in Duluth.

Duluth, MN, Minnesota, William A. Irwin Ore Boat moored at the dock in Duluth Harbor on Lake Superior in Duluth.

Duluth, MN, Lake Superior, Minnesota, William A. Irwin Ore Boat moored at the dock in Duluth Harbor on Lake Superior in Duluth.

Duluth, MN, Lake Superior, Minnesota, William A. Irwin Ore Boat moored at the dock in Duluth Harbor on Lake Superior in Duluth.

lake freighter, Duluth, MN, Minnesota, Lake Superior, William A. Irwin Ore Boat docked in Duluth Harbor on the waterfront in Duluth.

Duluth, MN, Lake Superior, Minnesota, Aerial view of the freight train yard in Duluth along Lake Superior.