aerial view of saint brisson renaissance palace castle on a hilltop in the loire valley

fortification machicolation crenellation saintbrisson battlements concentric drawbridge portcullis stronghold courtyard defensive fortified gatehouse undefined barbican hoarding recessed curtain latrine parapet postern shutter bailey castle chapel crenel donjon feudal merlon murder turret wooden ditch great tower mound spout yard moat hole spur twin wall door