ancient architecture battlements building city defence defend defensive fortification historical Israel Jerusalem landmark limestone old secure security stone strength strong tower wall arch church corbel decorative doors dordogne entrance France french hinges ornate protect walls cloud Damascus Gate gatehouse sky bridge Cahors fortified home house reflection river water archway castle lamp lantern path Bonaguil flag high keep power protection Remains beam bricole Castelnaud-la-Chapelle catapult machine mediaeval perrière ramparts sling throw trebuchet war weapon