A monk walks around a Buddhist tower at the Sanyai Monastery, during the Saga Dawa Festival, in Zhanang County of Shaanan City, southwest China's Tibet Autonomous Region, May 21, 2016. The Saga Dawa Festival, which honors the life of Buddha, is celebrated on the 15th day of the 4th Tibetan month and is one of the most important religious festivals celebrated in Tibet. Buddhists on this day usually goes to temples, raise a prayer pole and light butter lamps. (Xinhua/Liu Dongjun)