Ключевые слова: aerial, ancient, architecture, away, balkans, building, bulgaria, bulgarian, castle, citadel, city, cityscape, construction, drone, fortification, fortress, gate, green, hill, historical, history, house, krakra, landmark, landscape, medieval, mountain, museum, nature, old, outdoor, outdoors, panorama, panoramic, pernik, rooftop, ruin, ruins, sightseeing, skirt, sky, skyline, stone, stronghold, tourism, tower, town, traditional, valley, wall,