"China has been building bits of the Great Wall since before it was a nation. That part now identified as Wan Li Chang Cheng, or the 10,000 Li Wall, is believed to have been started in the Spring and Autumn Period (770-476 B.C.) and the Warring States Period (475-221 B.C.), and rebuilt through the following dynasties. In Beijing, there are four stretches of Great Wall open to tourists, Badaling, Juyongguan, Mutianyu and Simatai, and each has their own features." |
-Beijing Official Guide, May 2002, page 14 |