Croix de Fer & Glandon

Two Tour de France cols linked from Bourg-d'Oisans in one loop: up the Combe d'Olle to the iron cross at 2,067 m, a short spur to the Glandon, then thirty-seven kilometres back past turquoise reservoirs — 79.1 km and 1,908 m of climbing that never quite finish when the descent begins.