Photo taken on May 17, 2013 shows a worker maintaining Nuomi dam in Huajiakou section of China's Grand Canal, in Anling township of Jingxian county, North China's Hebei province. The dam, a turning point on the canal, used to breach a lot before it was reinforced in 1911. It was listed as a heritage point of China's Grand Canal in 2013. [Photo/Xinhua]