This mountain has been used 15 times in the Tour de France, with the stage most often ending up Alp d’Huez. We approached the summit from Le Bourg-d’Oisans. The views along the way are amazing.
Each village or townlet in France seems to have a public spring fed water stop. Very friendly for cyclists.

Cool cool water
You can see here how an ancient goat path between villages later became the road.
The top:

La Croix de Fer
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