Ключевые слова: ancient, architecture, asia, barrier, beijing, boundary, brick, china, chinese architecture, chinese culture, culture, defense, desolate, early morning, empty, famous place, far east, great wall, great wall of china, haze, hazy, heritage, historical, history, landmark, majestic, morning, mountain, mountainside, mutianyu, nobody, old, protection, ruins, safety, security, sightseeing, stone, tourism, tourist attraction, travel, travel destination, wall,