aerial view of star d fort in almeida portugal

architectonic fortification architecture counterguard counterscarp edification sightseeing chauguette cityscape ciudadela undefined bartisan bartizan building entrance exterior flanking hornwork military portugal pyrenees tenaille almeida cannons citadel covered daytime edifice guerite lunette rampart ravelin redoubt bridge castle facade famous glacis sentry shaped ditch shape stone acopy blue city door draw fort moat star box sky