Absolutely STUNNING Pyrenean mountain pass, not very well known and therefore usually very calm to simply desolate. Stunning views, fairly good surface. Can be fast if you want to, but the scenery is so pretty it's a shame to really blast through: better turn down the volume a notch or two, and enjoy the breathtaking surroundings. I've got the stretch on video, if you want: https://www.youtube.com/watch?v=rhG7SNFfnSM (or search for Burdincurucheta on youtube). Enjoy!