Estaing, Conques, Figeac, Cajard, Cahors, Montcuq, Moissac, Auvillar, La Romieu, Aire sur l'Adour, Navarrenx, St Palais, and Rocamadour if you do the GR6 variant. Actually the route has been walked for so long by so many they all have a meaning.
Buen camino