ditch with stagnant water covered with bloom algae at charlemont fortress

ditch stagnant water covered bloom algae charlemont fortress surrounded wild vegetation brick walls bridge background sunny day givet ardennes department france grass stream canal creek river ancient aqueduct architecture bastion battle border building bunker castle citadel countryside defence entrance europe exterior fort french green heritage hill hillside landmark medieval moat mountain old path rock stone stones structure summer tourism tourist tourists travel view wall war