China is marking 90 years since the victory of the Long March, a military trek crucial to the founding of the People's Republic of China. The 12,500-kilometer journey from Jiangxi to northern Shaanxi took the Red Army over a year to complete on foot. Today, traveling between Ruijin in Jiangxi and Yan'an in Shaanxi takes just half a day by high-speed railway. CGTN's Chen Lanyou travels to Yan'an, the train's final destination and the revolutionary heartland of the Communist Party of China after the Long March, to retrace this legendary journey.