Children play at the gate of an old castle in Liangbu Village of Longde County, northwest China's Ningxia Hui Autonomous Region, May 23, 2017. Liangbu was listed as a traditional village of the country in 2012. The village's old castle, which measures 170 meters in length and 70 meters in width, has a history of about 400 years. (Xinhua/Li Ran)
