A tourist walks inside the Ice Palace glacier hollow at Hintertux glacier, located at around 3250 meters above sea level, in Zillertal, Austria, 02 March, 2016. The hollow's temperature remains constant at 0 degrees Celsius, in summer and winter alike, and is also used by the University of Innsbruck for scientific research projects. (Photo by Lisi Niesner/EPA)

The Invasion. A quiet street in Macau. Modernization around is quickly changing the city, as documented by Paul Tsui. (Photo by Paul Tsui/National Geographic Travel Photographer of the Year Contest)

A woman selling souvenirs walks through Kuta beach in Bali June 5, 2008. Indonesia is expected to report tourist arrivals in December this week. (Photo by Murdani Usman/Reuters)

A woman poses for photos in snowfall on a podium installed on International Women's Day in central St. Petersburg, Russia, Wednesday, March 8, 2023, with a police officer in the background. International Women's Day on March 8 is an official holiday in Russia, where men give flowers and gifts to female relatives, friends and colleagues. (Photo by Dmitri Lovetsky/AP Photo)

A woman athlete aims an air rifle while competing in a local shooting championship in Yemen's Huthi rebel-held capital Sanaa on January 3, 2023. (Photo by Mohammed Huwais/AFP Photo)

Oscar-winning directors Daniel Kwan and Daniel Scheinert, known collectively as the Daniels, march with Writers Guild of America members outside Sunset Bronson Studios and Netflix Studios, after union negotiators called a strike for film and television writers, in Los Angeles, California, U.S., May 3, 2023. (Photo by Mario Anzuoni/Reuters)

A model rehearses with a fabric face mask on, designed by Zhou Li for her Autumn/Winter 2020 collection show, during China Fashion Week in Beijing, following the novel coronavirus disease (COVID-19) outbreak, China on May 3, 2020. (Photo by Tingshu Wang/Reuters)

A schoolgirl walks on an under-construction railway track at Navapura, on the outskirts of Ahmedabad, November 29, 2019. (Photo by Amit Dave/Reuters)