A few months ago, I learned about the interesting medieval folk-etymology, as it were, of attributing feats of human engineering and architecture to the Devil. Certainly a peasant would be struck with disbelief upon first encounter with some of the robust and precarious ramparts and bulwarks of civil design.I came across another example recently, though I am not sure if the legend and name was meant more than figuratively, in the Devil's Sentry-Box, perched on a ravelin on the imposing citadel of Sisteron. To construct this bunker with a commanding (vertigo-inducing) view atop the river Durance and opposite the other-worldly cliff formation of le Rocher de la Baume, it's said cost the master-mason his soul.