The Lamborghini Marzal was a prototype concept car presented by Lamborghini at the 1967 Geneva Motor Show. Designed by Marcello Gandini of Bertone, it was created to supply Ferruccio Lamborghini with a true four-seater car for his lineup which already included the 400GT 2+2 and the Miura. It was distinguished by amply glazed gullwing-doors and an equally amply louvered rear window. Propulsion was by a 2L 175 bhp (130 kW) in-line six engine, actually a split-in-half version of Lamborghini’s 4L V12, mated to a five speed transmission. Continue reading to see more rare prototype supercars from the past.