Ключевые слова: aerial, aerial imagery, aerial photography, anchor, anchor square, ancient, architecture, blue, cathedral, christianity, church, city, cloudless, day, historical, history, kronstadt, landmark, landscape, may, morning, naval, old, orthodox, people, petersburg, religion, russia, saint, sankt, sky, spring, st nicholas, st petersburg, sunny, temple, top view, tourists, town, travel, urban, view,