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 background barrier defence defensive elements historical Ibiza old Spain stone texture blue castle circular classic defense green sky style tower tree trees vegetation ancient buildings defend Girona protect security spanish town turret view walls arch dordogne France french passageway secure strong arrow slots curved light shadow battlements medieval power roof windows