Col d'Aubisque

The top section of the Col d'Aubisque has been described as the most beautiful 4 kilometers of road in Europe, if not the world. I don't know about the world, but I do know a beautiful place when I see it. If it's raining, snowing, covered in clouds, or preferably all three simultaneously then you really are lucky.
If you only ride one road in these Pyrenean mountains, this is the road to ride.