Photo taken on June 16, 2019 shows the tomb of unknown martyrs at the Changketou Village of Nanshan Town in Changting County, southeast China's Fujian Province. Since 1953, Zhong Yilong collected the names of martyrs who participated in revolution from 1928 to 1934. Zhong, a 91-year-old retired cadre, also set up an exhibition regarding the Red Army at his ancestral house several years ago to pass the history down. (Xinhua/Wei Peiquan)