Ключевые слова: abstract, ancient, antient, antique, architecture, baba, baba vida, bizarre, boundary, building exterior, building feature, built structure, bulgaria concentric, castle, city, concepts, culture, curtain, flooring, fort, fortified wall, fortress, history, inside of, large, medieval, no people, old, oldfashioned, paving stone, preserved, protection, rock, roman, security, shape, simplicity, stability, stone material, stone wall, strength, surrounding, surrounding wall, the past, towers, trapped, vida, vidin, wall, walls,