17. 1936 Duesenberg SSJ Speedster
In the '30s the average horsepower of a new car was 54. That makes the 320-horse Duesenberg SSJ the Bugatti Veyron of its day. The company described it as "The World's Finest Motor-Car" and nobody argued, because it was technologically decades beyond anything else on the market. Only two SSJ Speedsters were made, and they went to iconic celebrities Clark Gable and Gary Cooper.