Ключевые слова: 13th century, ancient, architecture, british, building, buttress, caernarfon, carnarfon, castle, europe, fort, fortification, fortress, great britain, heritage, historic, history, landmark, medieval, norman, north wales, old, polygonal, rampart, ruin, sea, sky, snowdonia, stone, stronghold, tower, town, turret, turrets, uk, wales, walls, welsh,