In August 1974, the still unfinished twin towers, at some 1,350 feet, were the tallest buildings in the world. The architectural monument inspired one daring young man, Philippe Petit, to commit what he called the "artistic crime of the century." The tightrope artist stepped out onto an illegally rigged wire 110 stories up, stretching 200 feet long between the two towers -- and essentially danced high above the street for almost an hour.