Ключевые слова: aerial, aerial view, ancient, bastion, bunker, church, city, countryside, defense, defensive, dutch, europe, fort, fortification, fortified, fortress, gates, grass, green, historic, historical, history, holland, houses, landmark, landscape, medieval, military, monument, naarden, netherlands, new dutch waterline, noordholland, north holland, old, overhead, protection, summer, tourism, town, travel, urban, vest, vesting, village, walls, waterline, work, zuiderwaterlinie,