pedestrian path leading to bridge in charlemont fortress, ditch with stagnant water

ancient aqueduct arch architecture ardennes bastion battle border building bunker castle citadel countryside defence ditch entrance europe exterior forces fort fortification fortified fortress french green heritage hill hillside historic history landmark medieval moat monument mountain old path rock ruins stone stones structure tourism tourist tourists travel view wall war pedestrian leading bridge charlemont stagnant water blooming algae brick walls sunny summer day blue sky givet department france