Pikes Peak. It's one of the most grueling races in the world, climbing steeply uphill some 20 kilometers around 150 curves to the summit at 4,301 meters. These days the course is paved, but back in 1987 it was all dirt. That's when the legendary Walter Röhrl drove the 600-horsepower Audi Sport Quattro S1 up the mountain in a blistering 10:48. Sure, others have done it quicker since, but they've done it on pavement whereas Röhrl did it in the dirt.