People take a selfie on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend. (Photos: Xinhua)

People walk on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend.

People walk on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend.

People walk on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend.

A man takes a selfie on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend.

A boy rests on Manezhnaya Square during the Moscow City Day celebrations in Moscow, Russia, Sept. 11, 2021. Moscow celebrated its 874th anniversary to honor the city's founding this weekend.