Tourists visit the Crescent Spring and Mingsha Mountain (Singing Sand Dune) scenic site in Dunhuang, northwest China's Gansu Province, Oct. 3, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Zhang Xiaoliang)

Tourists take a selfie among flowers in Yancheng City, east China's Jiangsu Province, Oct. 7, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Zhou Gukai)

Aerial photo taken on Oct. 6, 2018 shows tourists visiting the Yimeng Mountain in Linyi, east China's Shandong Province. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Wu Jiquan)

Tourists visit the Crescent Spring and Mingsha Mountain (Singing Sand Dune) scenic site in Dunhuang, northwest China's Gansu Province, Oct. 3, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Zhang Xiaoliang)

Tourists visit the Sun Yat-sen Mausoleum in Nanjing, capital of east China's Jiangsu Province, Oct. 4, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Liu Jianhua)

Tourists visit the Slender West Lake in Yangzhou, east China's Jiangsu Province, Oct. 7, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Zhou Haijun)

Tourists visit the Chengde Mountain Resort in Chengde, north China's Hebei Province, Oct. 7, 2018. China witnessed 726 million domestic tourists during the National Day holidays on Oct. 1-7, growing by 9.43 percent year on year. (Xinhua/Liu Huanyu)