battlements castle crenellation fortified granite highlands hill hilltop Inverness landmark overlooking red scotland scottish stone top tower walls windows ancient architecture battlement big blue castles cloud clouds heavy historic Huntingtower Perth prince roost summer turret vacation visitors wall building city david defence fort fortifications historical Israel Jerusalem old ramparts security gatehouse archer archery defend defense defensive element England english Great Britain slot window dordogne France french power protect roof secure strong kent stronghold Walmer brick britain british buildings castellated classic hedge house houses London round chimney details flag flagpole rooftop saltire sandstone arrow fortress protection uk