The Harley-Davidson Museum in Milwaukee, Wis., is owned by the 110-year-old company — and it’s a two-wheel thrill ride into hogs and history. The 130,000-square-foot museum complex is just a mile from the Santiago Calatrava-designed Milwaukee Art Museum. More than 500 vehicles and thousands of artifacts comprise the motorcycle museum’s collection, including Harley-Davidson Serial Number One — the oldest known Harley in the world, with a clearly stamped “number one.” “This isn’t just a piece of Harley-Davidson history; it’s American history, too,” says Bill Davidson, vice president of the museum and the great-grandson of co-founder William Davidson. Jump on, stop in.