Fort du Mont Verdun
France · built 1874
Fort Mont Verdun is the biggest highlight of the second belt of Forts around Lyon and is the only one considered to be a mountain fort. It rests at 630 meters altitude, dominating Lyon, Limonest, the lower Azergues valley and the Saône valley. It was covered by a low battery and four other associated batteries: Mont Thou, Les Carrières, Narcel and La Freta. It is now occupied by the Airbase 942 Lyon-Mont Verdun. This belt of forts included the forts of Bron, Vancia, Fort de Feyzin and Fort du Mont Verdun itself.
Fort data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).