A Chinese tourist visits the Mutianyu Great Wall covered in snow on February 23, 2021 in Beijing, China. Affected by the new coronavirus (COVID-19), the number of visitors to Mutianyu Great Wall in 2020 dropped by about 60%. (Photo by Lintao Zhang/Getty Images)

Ammunition airlift into besieged Khe Sanh, Operation Pegasus, April 1968. (Photo by Larry Burrows/AP Photo)

A car made from parts taken from used vehicles is shown in street Hefei, Anhui Province in China, on Oktober 21, 2013. The machine, which reaches 60 km/h, is the brainchild of self-taught inventor Zhu Runqiang. (Photo by Reuters/China Daily)

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A protester is taken away by police during an electoral campaign closing rally of Spain's far-right party VOX in Madrid, Spain on April 26, 2019. (Photo by Juan Medina/Reuters)

Bride Ana Vallejos, wearing a traditional “Caporales” Andean outfit, is escorted by her parents to her wedding celebration, in La Paz, Bolivia, Saturday, December 12, 2020. As a measure to reactivate the economy, the Bolivian government lifted restrictions to help curve the spread of the new coronavirus. Sporting, religious and cultural events may take place publicly until mid-January. (Photo by Juan Karita/AP Photo)

A woman takes a selfie in front of a Lunar New Year display featuring sheep at a shopping mall in Hong Kong, February 13, 2015. (Photo by Bobby Yip/Reuters)

Traffic police stand at the side of a road in Pyongyang on November 25, 2016. (Photo by Ed Jones/AFP Photo)

A dressed up Oakland Raiders fan poses for photos as she arrives at Azteca stadium in Mexico City, Monday, November 21, 2016. The Oakland Raiders face the Houston Texans at a sold out Azteca stadium. (Photo by Dario Lopez-Mills/AP Photo)