Tourists travel across China on first day of May Day holiday

Tourists visit the Mogao Caves in Dunhuang, northwest China's Gansu Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Fan Peishen)

Tourists visit Beijing International Horticultural Exhibition in Beijing, capital of China on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Zhang Chenlin)

Tourists visit the West Lake in Hangzhou, east China's Zhejiang Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Huang Zongzhi)

Tourists visit the West Lake in Hangzhou, east China's Zhejiang Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Huang Zongzhi)

Tourists visit an aquarium in Shenyang, northeast China's Liaoning Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Long Lei)

Tourists visit an aquarium in Shenyang, northeast China's Liaoning Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Long Lei)

Tourists visit Beijing International Horticultural Exhibition in Beijing, capital of China on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Zhang Chenlin)

Tourists visit the Mogao Caves in Dunhuang, northwest China's Gansu Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Fan Peishen)

Tourists visit Beijing International Horticultural Exhibition in Beijing, capital of China on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Zhang Chenlin)

Tourists visit the West Lake in Hangzhou, east China's Zhejiang Province on May 1, 2019, the first day of the four-day May Day holiday. (Xinhua/Huang Zongzhi)