Visitors wait in line to enter the Summer Palace in Beijing on March 22, 2020. Due to the coronavirus outbreak, the Summer Palace requires visitors to show identification cards, wear masks and keep a distance of 1.5 meters from each other. The number of daily visitors is also limited. [Photo by Yan Xiaoqing/China.org.cn]

Security guard and visitors wear masks at the Summer Palace on March 22, 2020. Due to the coronavirus outbreak, visitors are required to wear masks and keep a distance of 1.5 meters from each other. [Photo by Yan Xiaoqing/China.org.cn]

Staff in the Summer Palace hold signs to remind visitors to keep a distance from each other and wear masks. [Photo by Yan Xiaoqing/China.org.cn]

Trees blossom at the Summer Palace, on March 22, 2020. [Photo by Yan Xiaoqing/China.org.cn]

A Summer Palace staff member holds a sign to remind visitors to wear masks and wash their hands. [Photo by Yan Xiaoqing/China.org.cn]

The spring scenery at the Summer Palace in Beijing, on March 22. 2020. [Photo by Yan Xiaoqing/China.org.cn]

A photo taken on March 22, 2020 shows a magnolia blossoms at the Summer Palace in Beijing. [Photo by Yan Xiaoqing/China.org.cn]

A magnolia blossoms at the Summer Palace in Beijing, on March 22, 2020. [Photo by Yan Xiaoqing/China.org.cn]

A magnolia blossoms at the Summer Palace in Beijing, on March 22, 2020. [Photo by Yan Xiaoqing/China.org.cn]

Photo taken on March 22, 2020 shows magnolia blossoms in the Summer Palace in Beijing. [Photo by Yan Xiaoqing/China.org.cn]