Today, Harley Davidson motorcycles are a household name, but it hasn't always been that way. It began way back in 1901, when a young man named William S. Harley had a vision for attaching an engine to a bicycle. William had a friend named Arthur Davidson who embraced his concept. Together, they began working endless hours in a small wooden shed, with the words Harley Davidson scrawled on the door. By 1903, they rolled out the first production Harley Davidson motorcycle.