ancient architecture castle elements fortress Golan Heights hills historical Israel Mivtzar Nimrod mountains Nimrod Nimrud old Qal'at Namrud Remains ruins stone stronghold trees valley view arch blocks capstone entrance wall battlements blue Carlisle cloud clouds copyspace defend defensive England flag flagpole gate grass green moat safe secure sky strong tower walls above attraction cliff distant fields fort headland hill keep monument ramparts ruin ruined rural scarborough tourist decay defence defense desuetude Greece Greek high hilltop Mystras UNESCO World Heritage window archway battlement entry Great Britain protection royal security tourism uk Windsor