On May 4, 2023, China's Youth Day, many citizens and tourists visit the themed exhibition at the "Red Building" of Peking University in Beijing. The "Red Building," once the main campus of Peking University, has witnessed several of China's major historical events, including the New Culture Movement and the May Fourth Movement, both of which greatly contributed to the early spread of Marxism in the country and the founding of the CPC. China's Youth Day, which falls on May 4 every year, marks the anniversary of the May Fourth Movement in China. Photos: Li Hao/GT