One of the unique features of Beijing is its numerous Hutongs which means small lanes. The life of ordinary people in these lanes contributes greatly to the charm of this ancient capital. In these small lanes, you'll find many siheyuan, or quadrangles which are the living quarters of ordinary Beijingers. No one knows exactly how many lanes there are in Beijing which has been China's capital for five dynasties, but one thing is certain, if we connected all these lanes, their total length would be longer than the famous Great Wall, which is more than 6,000 kilometers' long.