Barrière de fer
The Fort de l'Olive is a fortification in the vicinity of Briançon in the Dauphiné region of southeastern France. Built in 1881 it was originally called the "Ouvrage du Bois des Gasquets", it was the third and final fort built near Briançon as part of the Séré de Rivières system of fortifications in the 1870s and 1880s.