CANGZHOU, Dec. 3 (Xinhua) -- In history books, the Grand Canal served as the economic lifeline that connected Beijing in north China and Hangzhou in east China's Zhejiang Province, and also as a testament to the ambitions of emperors. But when the hustle and bustle fades, what is the most precious legacy the canal leaves for today? Follow British vlogger Adam to find out the answer in Cangzhou, a major hub of this world's longest artificial waterway as it winds through north China's Hebei Province.