Ключевые слова: abandoned, american, architecture, army, artillery, attack, battery, battle, blue, british, building, bunker, coast, coastal, concrete, construction, defense, europe, european, field, fort, fortification, german, green, gun, historic, historical, history, holland, ii, invasion, landmark, landscape, line, military, monument, nature, netherlands, old, protection, rampart, ruin, second, second world was, shelter, sky, stone, travel, was, world,