The Mille Miglia was an open-road, motorsport endurance race established in 1927 by the young Counts Francesco Mazzotti and Aymo Maggi. It took place in Italy 24 times from 1927 to 1957. From Wikipedia
The film, featuring authentic replicas of vintage race cars and real driving by Patrick Dempsey, centers on the dangerous 1957 Mille Miglia race.