The 13x13 is an itinerary I devised that reach every summit over 1300 meters in the Vosges. There are (depending on how one counts) thirteen of them, hence the name.
I tried it in the summer of 2012, we did it in 3 days. It offers a scenic view all along the way, and is not too difficult.
I intend to try it in winter with skis very soon.Itinerary on Camp to Camp