The Spanish Grand Prix at Montjuich Park in 1969 was the last race of the high-winged F1 cars, and for a very good reason.
The wings had sprouted the year before and had quickly become ubiquitous aerodynamic elements, thanks to a set of rules which gave everyone a free pass to develop the designs as they saw fit.
But in Spain, both Graham Hill and Jochen Rindt saw their Lotus wings collapse in the race, a few laps apart, with their cars taking off after a crest and careering madly out of control. Both men miraculously survived the massive crashes although Rindt suffered some nasty cuts and abrasions to his face.
Two weeks later in Monaco, the CSI governing body held a meeting after the first practice session in the Principality, and put a ban on the high wings.