Photo taken on March 26, 2018 shows visitors taking photos of the Fengyan Terraces in Xuanwuo Township of Hanyin county, northwest China's Shaanxi Province. The Fengjiang Terrace and Yanping Terrace, or the Fengyan Terraces, which could date back to over 250 years ago are of great significance to the study of Chinese ancient farming culture. (Xinhua/Tao Ming)