2,300-year-old wine found in the Great Wall ruins

China's former leader Mao Zedong wrote a poem in 1935 during the Long March of the Red Army, passing through the Liupan Mountains in Guyuan, Gansu.

The poem mentions the Great Wall, referring to the Qin Great Wall built between 325-251 BC. This wall is one of the oldest Great Walls built in China and has a history of 2,300 years.