Mobile photo taken on Aug. 10, 2019 shows scenery at the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China. (Xinhua/Zhang Chao)

Mobile photo shows people climbing the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China, Aug. 10, 2019. (Xinhua/Zhang Chao)

Mobile photo shows people climbing the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China, Aug. 10, 2019. (Xinhua/Zhang Chao)

Mobile photo shows people climbing the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China, Aug. 10, 2019. (Xinhua/Zhang Chao)

Mobile photo taken on Aug. 10, 2019 shows scenery at the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China. (Xinhua/Zhang Chao)

Mobile photo taken on Aug. 10, 2019 shows scenery at the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China. (Xinhua/Zhang Chao)

Mobile photo taken on Aug. 10, 2019 shows scenery at the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China. (Xinhua/Zhang Chao)

Mobile photo taken on Aug. 10, 2019 shows scenery at the less renovated Badaling Old Great Wall, southwest of the famous Badaling Great Wall, in Beijing, capital of China. (Xinhua/Zhang Chao)