battlement brick bricks defense defensive wall walls window windows castle fortified medieval tower town angles appearances architectural architectural elements architecture building carnels corbels crenellation crenels decorative decorative-battlements defensive-architecture defensive-wall extended-outwards fort fortification fortress masonry-structure merlons ornamental ornamentation parapet ramparts segment supported supporting-corbels supports wall-segment wall-tower background barrier defence elements historical Ibiza old Spain stone texture ancient arrow slots curved defend Girona light protect security shadow spanish turret battlements cliff Edinburgh fortifications grey hill hilltop rocks secure army border conflict corrugated disused iron Israel land military safety shelter trenches warfare blue circular classic green sky style tree trees vegetation buildings view