The Saturn Rockets, what was and what might have been

Almost everyone has heard of the Saturn V, the Rocket that sent men to the moon.  It was and still is the largest, most powerful booster ever flown.  Over forty years ago, the american space program was able to design, build, and fly this monster in less than a decade.   The Saturn V development, done at a time when much still needed to be learned about launch systems, took only 4 years to complete (Contract awarded in 1962, first flight in 1966.)