Local residents in some sections sell bricks that have historic engravings on them. Dong Yaohui More Quotes by Dong Yaohui More Quotes From Dong Yaohui The Great Wall is a vast heritage site -- over 20,000 kilometers -- hence increasing the difficulty in preservation and restoration, reliance on a very small amount of manpower by the local heritage departments is not enough to guard and protect the site. Dong Yaohui top-news
