Fortress of Charlemont - Credit: Wikimedia Commons
The Fortress of Charlemont () is a French stronghold located near the Belgian border on the Meuse. It is a citadel, surrounded by a network of outworks, including the connecting forts (Givet and the Mont d'Hours). It dominates the town of Givet and when in use as a working fortress controlled the valley of the Meuse. Read more on Wikipedia
Source: en.wikipedia.org