People visit in the Dashilan commercial zone of Qianmen Street in Beijing, capital of China, Feb. 9, 2017. Beijing has strengthened the protection of cultural sites in recent years, aimed to improve environment for people's living and travelling. (Xinhua/Li Xin) 

People watch the Palace Museum at Jingshan Park in Beijing, capital of China, Feb. 8, 2017. Beijing has strengthened the protection of cultural sites in recent years, aimed to improve environment for people's living and travelling. (Xinhua/Li Xin)

Photo taken on Feb. 8, 2017 shows the Palace Museum seen from Jingshan Park in Beijing, capital of China. Beijing has strengthened the protection of cultural sites in recent years, aimed to improve environment for people's living and travelling. (Xinhua/Li Xin)  

People visit the Qianmen Street in Beijing, capital of China, Feb. 9, 2017. Beijing has strengthened the protection of cultural sites in recent years, aimed to improve environment for people's living and travelling. (Xinhua/Li Xin)

People visit Qianmen Street in Beijing, capital of China, Feb. 9, 2017. Beijing has strengthened the protection of cultural sites in recent years, aimed to improve environment for people's living and travelling. (Xinhua/Li Xin)