I probably should mention a couple of things about this place - this is actually still used by the French military, and while you can go on tours you actually have to book at least two weeks in advance. Unfortunately I didn't so all we got to see what the outside. Anyway, this place is referred to as 'The Queen of Citadels', namely because it was designed to basically be impregnable. However, since I didn't get to go inside I can't really say all that much about it, other than it is actually a pretty old citadel, but it is still being used. read more