There are a lot of difficult and iconic ski runs in the world, from Jackson Hole's Corbet's Couloir to the impossibly steep Streif at Kitzbühel. But when combining steep slopes with massive moguls, nothing in Europe can compare to The Swiss Wall at Les Portes du Soleil. Starting from Avoriaz in France and ending in Les Crosets in Switzerland, the Swiss Wall is often considered one of, if not the, most difficult on-piste slopes in Europe.