Ключевые слова: aerial view, ancient, antique, architecture, attraction, baba, baba vida, blue, brick, brown, building, bulgaria, bulgarian, castle, coastline, cobble, culture, danube, danube river, defensive, european, fort, fortification, fortified, fortress, heritage, historical, history, landmark, landscape, medieval, monument, old, river, ruins, sky, stone, stronghold, tourism, tower, town, travel, vida, vidin, wall, watchtower, water,