A boy holds a Chinese flag as he stands in front of a portrait of Sun Yat-sen, who is widely regarded as the founding father of modern China, at Tiananmen Square on the first day of the May Day holiday in Beijing, Saturday, April 30, 2016. Millions of Chinese are taking advantage of the May Day holidays to visit popular tourist sites. [Photo/IC]

A large number of people visit Longmen Grottoes, a world cultural heritage site near Luoyang city in Central China's Henan province, April 30, 2016. Longmen Grottoes has more than 2,300 grottoes with 110,000 Buddhist figures and images, over 80 dagobas and 2,800 inscribed tablets. All were created between the Northern Wei Dynasty (386-557) and Song Dynasty (960-1279). [Photo/IC]

Though the Shanghai Disney Resort theme park in is slated to open in mid-June, its service area, Disney Town, has already attracted many people, April 30, 2016. [Photo/IC]

Zhan Bridge, a landmark in Qingdao, Shandong province, is filled with tourists, April 30, 2016. [Photo/Xinhua]

Dr. Sun Yat-sen's Mausoleum, situated in Zhongshan scenic area in Nanjing, East China's Jiangsu province, is welcoming a large number of tourists. [Photo/IC]

Children chase each other through the sea of flowers at a peony cultivation base in Shihe town, Bozhou of East China's Anhui province, April 29, 2016. [Photo/IC]