This section of The Wall is accessed at Badaling. The Wall was orignally built in the seventh century B.C. It has been rebuilt, reconfigured and lengthened over the centuries with a major undertaking in the Qing Dynasty, 221 B.C. The Wall, as seen today, dates largely from the Ming Dynasty (1368-1644); its length is about 4000 miles, running East to West across northern China. It is a very popular venue for the Chinese people as well as for tourists from all over the world.