Ключевые слова: ancient, architectural, architecture, art, blue, building, bulgaria, bulgarian, capital, cathedral, christian, christianity, church, city, color, concept, culture, dark, design, detail, dome, downtown, eastern, europe, european, exterior, historic, landmark, monument, old, orthodox, outdoor, religion, religious, sky, sofia, stone, street, temple, tour, tourism, tower, traditional, travel, urban,