Wang Shuiyuan shepherds his sheep on a small hill. In Yongtai, this is generally the only skill the residents have. According to historical evidence, the ancient city was once covered by fertile land and surrounded by dense forest. Older people recall that when they were young, the inner city was filled with plants and trees, and the city wall was surrounded by a moat. But now, there is less and less grass for the sheep to feed on. [Photo: Sina]