The Aerial Lift Bridge (earlier known as the Aerial Ferry Bridge) is a landmark in the port city of Duluth, Minnesota. The span began life in 1905 as the United States' first transporter bridge. (Only one other was ever constructed in the country, Sky Ride in Chicago). In 1929–30, the span was converted to a vertical lift bridge (also rather uncommon, although there are six such bridges along Ontario's Welland Canal), and continues to operate today. The bridge was added to the National Register of Historic Places on May 22, 1973. The United States Army Corps of Engineers maintains a nearby maritime museum. Poster Print A poster print is created using a professional laser printer on heavy, cover stock paper. The quality of the print and of the paper vary. Colors are placed on the paper with dots. Artist Print An artist's proof is matte photographic proof produced by a professional printer. Colors are continuous and have no dots. Prints are NOT matted or framed. Original artwork by Jamey Penney-Ritter/Bemused Design. Copyright watermark will not appear on your print.