This aerial photo taken on May 3, 2023 shows people visiting the square of the Flood Control Monument in Harbin, northeast China's Heilongjiang Province. China has witnessed a travel boom during this year's five-day May Day holiday. (Xinhua/Zhang Tao)  

Tourists enjoy the night view of the ancient Bell Tower in Xi'an, capital of northwest China's Shaanxi Province, May 2, 2023. China has witnessed a travel boom during this year's five-day May Day holiday. (Photo by Zou Jingyi/Xinhua)  

Tourists visit Xi'an Bell and Drum Towers Museum in Xi'an, capital of northwest China's Shaanxi Province, May 1, 2023. China has witnessed a travel boom during this year's five-day May Day holiday. (Photo by Zou Jingyi/Xinhua)