The Tour de France will mark 100 years since the race first went over the Col du Galibier by visiting the legendary Alpine climb twice in 2011.
The 18th stage will end at the summit of the Tour's most climbed mountain, which at an altitude of 2,645 metres will be the event's highest finish.
The following day, the riders will take on the Galibier again before another mountain-top finish at Alpe d'Huez.
The race starts on 2 July in the Vendee and finishes in Paris on 24 July.
A 191km opening stage, instead of the more traditional time trial prologue, marks the Grand Depart of a race that has 10 flat and six mountain stages with four summit finishes in its 21 stages.