In winter, the Spiti valley is cut off the rest of the world. Under the snow, this former Tibetan kingdom still lives with its ancient traditions. Stuck between India and Tibet, the upper Spiti valley was long forbidden to foreigners. To reach in winter this mysterious land, jewel of the genuine Tibetan culture, one has to cross the Himalayan range following the mythic Indo-Tibetan Highway : a vertiginous track-road that explorers and caravans used to take.