Ключевые слова: amphitheater, ancient, antique, archaeological, archaeology, archeology, architectural, architecture, balkans, brick, building, buildings, bulgaria, bulgarian, center, city, classic, column, cultural, culture, destination, downtown, europe, european, forum, heritage, historic, historical, history, horizontal, landmark, medieval, odeon, old, outdoor, park, past, philippopolis, plovdiv, red, roman, ruins, sight, sightseeing, stone, thracian, tourism, town, travel, trip,