Beautiful and sinister in equal measure. It was custom built for Italian playboy Count Carlo Felice Trossi, based on the already-rare Mercedes-Benz Super Sport Kurz (SSK). As with many of the cars on our list, it isn’t without its mysteries. Porsche designed the car for Mercedes-Benz, but obviously that wouldn’t be good enough for the Count, Diddy to his friends. He hired a coachbuilder to hammer out this amazing new metal body, but to this day nobody knows who that was.