angles appearances architectural architectural elements architecture battlement 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 wall-segment wall-tower architectural-elements Australia Australian color colored colors colour coloured colours elements exterior external flag height high historic historic-building light old perspectives stone-work tower university university-building