Jerry and his two brothers were pioneer competitors at the Pikes Peak hillclimb; soon all four of his sons – twins Jerry Jr and Louis, as well as Bobby and Al Sr – would become racing drivers, too.

The Unser Racing Museum celebrates four generations of drivers who between them have nine victories in the Indianapolis 500. Al Unser Sr (born 1939) has four of them, the final one coming in 1987. Unser entered the race when regular Penske driver Danny Ongais was injured in a practice crash.

The year-old March 86C chassis shown here was retrieved from display in a hotel lobby. Unser qualified 20th but profited from late-race misfortune for Mario Andretti and Roberto Guerrero to take the win. A must for motorsport fans, let's see the other race car delights on offer at the museum: