Timbuktu: A UN peacekeeper from Burkina Faso stands guard at the Djinguereber mosque, built in the 14th century, during a visit by a UN delegation on election day in Timbuktu, Mali, July 28, 2013. (Photo by Joe Penney/Reuters)

Ultra- trailers compete at sunrise on September 2, 2017 in Courmayeur, Italy, during the 15 th edition of the Mount Blanc Ultra Trail (UTMB), a 170 km race around the Mont Blanc crossing France, Italy and Switzerland. The 15 th Ultra- Trail du Mont- Blanc (UTMB) is a mountain ultramarathon with numerous passages in high altitude (>2500 m) and in difficult weather conditions (night, wind, cold, rain or snow). (Photo by Jeff Pachoud/AFP Photo)

A person viewing the Northern lights over the lava landscape, Reykjanes Peninsula, Iceland. (Photo by Arctic-Images/Getty Images)

A cat sits in the flooding waters from Hurricane Matthew in downtown Nichols, South Carolina, October 10, 2016. (Photo by Randall Hill/Reuters)

A masked woman poses for a picture during a march demanding justice for the victims of gender violence and femicides in Mexico City, Mexico on August 16, 2020. (Photo by Raquel Cunha/Reuters)

A worker roasts a row of pigs on bamboo poles at a roasting pit, in Manila, Philippines, December 21, 2020. (Photo by Lisa Marie David/Reuters)

Anissa Barbato from New York looks out over the city as she takes pictures from the Edge, the highest outdoor sky deck in the Western Hemisphere on September 2, 2020 as it reopened to the public in New York. Rising 1,131 feet in the air from the heart of Hudson Yards it offers 360-degree views of New York Citys iconic skyline from the 100th floor outdoor viewing. (Photo by Timothy A. Clary/AFP Photo)

Vancouver Canucks centerZack MacEwen (71) fights with Winnipeg Jets defenseman Derek Forbort (24) during first-period NHL hockey game action in Vancouver, British Columbia, Sunday, February 21, 2021. (Photo by Jonathan Hayward/The Canadian Press via AP Photo)