Ключевые слова: ancient, archeology, architecture, brick, building, bulgaria, castle, citadel, construction, defense, europe, fort, fortification, fortified, fortress, fortress kaleto, historical, history, iskar, kaleto, landmark, landscape, medieval, mezdra, military, mountain, park, remains, remnants, river, rock, roman, ruin, ruins, sight, sights, sightseeing, stara planina, stara planina mountain, stone, tourism, tower, town, travel, wall,