While the Motirolo may be harder, less forgiving, a real swearing under the breath ascent, the Passo della Stelvio and its incredible winding roads are surely more infamous. This climb deserves its reputation. The stunning hairpins and snowy backdrop (even in late May) leads you up one of the highest paved roads in Europe. So high, that making it to the top is a challenge in itself. Making it down, although occasionally hair-raising, is probably the most fun you're likely to have on a road bike. Attacking it on a year the Giro took a doppio pass of this mythical mountain, means fresh hot mix too.