Photo taken on Nov. 13, 2019 shows the Great Wall in Guyang county, Baotou, North China's Inner Mongolia autonomous region. The Great Wall, with a length of 95.6 kilometers and located on a mountain in Guyang, is mainly built with stones and has been preserved for over 2,000 years. [Photo by Bei He/Xinhua]

Photo taken on Nov. 13, 2019 shows the Great Wall in Guyang county, Baotou, North China's Inner Mongolia autonomous region. The Great Wall, with a length of 95.6 kilometers and located on a mountain in Guyang, is mainly built with stones and has been preserved for over 2,000 years. [Photo by Bei He/Xinhua]

Photo taken on Nov. 13, 2019 shows the Great Wall in Guyang county, Baotou, North China's Inner Mongolia autonomous region. The Great Wall, with a length of 95.6 kilometers and located on a mountain in Guyang, is mainly built with stones and has been preserved for over 2,000 years. [Photo by Bei He/Xinhua]