A young Free Syrian Army fighter holds a rifle in Haresta neighbourhood of Damascus January 16, 2013. (Photo by Goran Tomasevic/Reuters)

A recruitment drive during the First World War at Trafalgar Square, London. (Photo by Central Press/Getty Images)

Dancers at the Windmill Theatre in London, England practice a routine wearing gas masks and hard-hats with their costumes, 1940. (Photo by Hulton Archive/Getty Images)

A photograph taken on November 20, 2021 shows the barberry berries with water drops after a rain in the garden outside Moscow. (Photo by Yuri Kadobnov/AFP Photo)

The Jinshanling Great Wall is seen after a rainfall on March 31, 2022 in Chengde, Hebei Province of China. (Photo by Zhou Wanping/VCG via Getty Images)

People observe a protest against a new citizenship law from a bus, in New Delhi, India, January 3, 2020. (Photo by Anushree Fadnavis/Reuters)

Andrey Karr from Western Riders Slacklines at sunset above big waves in Nazare, Portugal on December 27, 2017. (Photo by Aidan Williams/National Geographic Travel Photographer of the Year Contest)

Visitors are seen inside a newly opened bookstore in Chongqing, China on January 29, 2019. Covering an area of 1,400 square meters, the Zhongshuge Bookstore in Chongqing attracts readers with its creative decor. (Photo by Reuters/China Stringer Network)