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The grey Great Wallwinds in（缠绕）mountains and grey Siheyuan courtyards lie in hutongs. The grey is the tone of traditionalarchitectures（建筑学，建筑物）in Beijing. The Great Wall of China, one of the greatest wonders of the world, was enlisted in the World Heritage by UNESCO in 1987. Just like a gigantic dragon, the Great Wall winds up and down across deserts, grasslands, mountains andplateaus（高原）,stretching approximately 6,700 kilometers (4,163 miles ) from east to west of China. With a history of more than 2,000 years, it is one of the most appealing attractions all around the world owing to its architecturalgrandeur（庄严，伟大）and historical significance. For those who want to experience the real Beijing, the hutongs and Siheyuan (quadrangle) are indispensable and best place to visit. Hutong means street, lane and alley, and is in fact the passage formed by lines of siheyuan (quadrangle) where most Beijing residents live. One hutong connects with another, and siheyuan connects with siheyuan, to form a block, and blocks join with blocks to form the whole city. A hutong is an ancient city alley or lane typical in Beijing, where hutongs run into the several thousand. Surrounding the Forbidden City, many were built during the Yuan, Ming and Qing dynasties (1271-1911). In these dynasties the emperors planned the city and arranged the residential areas according to theetiquette（礼仪，礼节）systems. The center of the city of Beijing was the royal palace -- the Forbidden City. | 
