Fort Mont-Valérien is a fortress in Suresnes, a western Paris suburb, built in 1841 as part of the city's ring of modern fortifications. It overlooks the Bois de Boulogne.
Wikipedia https://en.wikipedia.org/wiki/Fort_Mont-Valérien
Official Website http://www.mont-valerien.fr/
Address Suresnes 92150, France
Coordinates 48°52'24.432" N 2°12'47.089" E