The Mille Miglia was an open-road, motorsport endurance race established in 1927 by the young Counts Francesco Mazzotti and Aymo Maggi, which took place in Italy twenty-four times from 1927 to 1957 (thirteen before the war, eleven from 1947).
Since 1977, the "Mille Miglia" has been reborn as a regularity race for classic and vintage cars. Participation is limited to cars, produced no later than 1957, which had attended (or were registered to) the original race. The route (Brescia–Rome round trip) is similar to that of the original race, maintaining the point of departure/arrival in Viale Venezia in Brescia.
This is my experience following the editions 2016-2019.