Tourists visit Badaling section of the Great Wall in Beijing, capital of China, March 24, 2020. The famous Badaling section of the Great Wall in Beijing has partly opened on Tuesday, after being closed for almost two months due to the novel coronavirus outbreak. (Xinhua/Chen Zhonghao)

Tourists visit Badaling section of the Great Wall in Beijing, capital of China, March 24, 2020. The famous Badaling section of the Great Wall in Beijing has partly opened on Tuesday, after being closed for almost two months due to the novel coronavirus outbreak. (Xinhua/Chen Zhonghao)

A staff member checks body temperature of visitors at the entrance of Badaling section of the Great Wall in Beijing, capital of China, March 24, 2020. The famous Badaling section of the Great Wall in Beijing has partly opened on Tuesday, after being closed for almost two months due to the novel coronavirus outbreak. (Xinhua/Chen Zhonghao)

A boy poses for photo at Badaling section of the Great Wall in Beijing, capital of China, March 24, 2020. The famous Badaling section of the Great Wall in Beijing has partly opened on Tuesday, after being closed for almost two months due to the novel coronavirus outbreak. (Xinhua/Chen Zhonghao)

Tourists visit Badaling section of the Great Wall in Beijing, capital of China, March 24, 2020. The famous Badaling section of the Great Wall in Beijing has partly opened on Tuesday, after being closed for almost two months due to the novel coronavirus outbreak. (Xinhua/Chen Zhonghao)