concrete bunker, block house from the second world war on the edge of la manche at sainte cécile plage in picardie

wall terrain geology rock cliff coast ruins sea fortification infrastructure mountain transport soil waterway track road tower concrete bunker block house from second world war edge manche sainte cécile plage picardie france europe beach house building bunker camiers concrete defense europe france hill manche calais picardie protection protection concept rock plage sand sea war chanel