People gather to worship "Yellow Emperor" who according to legend reigned nearly 5,000 years ago and is regarded as the ancestor of all Chinese people, during a memorial ceremony in Huangling County, northwest China's Shaanxi Province, April 4, 2017. Over 10,000 people attended the ceremony on Tuesday which is also the Qingming Holiday, or the Tomb-Sweeping Day. (Xinhua/Li Yibo)
