File photo shows a tomb with frescos which dates back to Tibetan Tubo Kingdom (about 618-842) in Wulan County, northwest China's Qinghai Province. A total of six archaeological projects were made public by the Institute of Archaeology of the Chinese Academy of Social Sciences (CASS) on Friday as "China's 2019 archaeological discoveries of the year." The six laureate archaeological projects include a Neolithic site of Longshan Culture in east China's Shandong Province, a tomb of the Spring and Autumn Period (770-476 BC) in Hubei Province, and a tomb with frescos which dates back to Tibetan Tubo Kingdom (about 618-842) in the high-altitude Qinghai-Tibet Plateau. (Xinhua)