Visitors wearing face masks to help curb the spread of the coronavirus tour the Shougang Park in Beijing, Sunday, May 2, 2021. Chinese tourists are expected to make a total of 18.3 million railway passenger trips on the first day of the country's five-day holiday for international labor day, according to an estimate by the state railway group, as tourists rush to travel domestically after the coronavirus has been brought under control in China. (AP Photo/Andy Wong)