'The longest commercially navigable inland waterway in the world starts in Minnesota.'
Stretching 2,342 miles, from Lake Superior in Duluth, Minnesota, all the way to the Atlantic Ocean, "Highway H2O," also known as the St. Lawrence Seaway, was one of President Eisenhower's many massive public works projects (the Interstate system being another). The Seaway, which cost over $470 million, required 5 years' work, moved 200 million cubic yards of earth, and includes 15 enormous locks. It opened in 1959 as a joint venture between the U.S. and Canada, and today is operated by the St. Lawrence Seaway Development Corporation.