Plaine Morte in Switzerland, ski lifts up to nearly 3000m,fabulous scenery with high alpine peaks and views over a glacier. Very varied descent all the way to Sion, starting with loose almost moonscape scree, finishing with some super exposed singletrack along side a gorge and a final drop through vineyards. High alpine routes dont get much better.
Either that or a trail alongside the Aletsch Glacier from fieschalp.