Between Wassen (Uri) and Innertkirchen (Bern canton) at 2,224 m — the most sinuous of the Urner Alps trinity alongside Grimsel and Furka, and the least-touristed. A tunnel bores through the summit ridge; take the old road to the top for the full experience. Open late May to October.
Clone it to your planner, customize dates and stops, then ride. All free.