As the Cold War ended, a resurgence in interest took place in France as many of the former fortifications the country spent so much time, money, and hope in keeping war away from the home door.  The jury of historical writers seem a bit divided in opinions regarding whether the fortifications built between the late 1920 and 1930’s accomplished much.  Forts have had a history of being very expensive and difficult to upgrade, keeping them current with the rapid advances in artillery.