This location-based smartphone application allows the family audience to discover the mining and defensive heritage Maurienne territory Gate at 2 available routes:

Small mining history:
The guide character Humbert Grange nineteenth century ironworks Master accompanies the visitor.

Top secret :
A 1910 soldier helps users restore a old map of Staff, all the defensive system of the early twentieth century, forts, batteries, optical positions. The two routes also offer entertainment.