People walk in the rain by the Grand Canal in Hangzhou, east China's Zhejiang Province, June 18, 2019. June 22 marks the fifth anniversary of the Grand Canal's being listed as a world heritage site. The Grand Canal, almost 3,200 km in total length, is the world's longest man-made waterway, stretching from Beijing to Hangzhou. It has a history of more than 2,500 years. Over 1,000 km of the canal was recognized as a world heritage site in 2014. (Xinhua/Jin Liwang)