A rider picks up a hada, a traditional Tibetan ceremonial scarf, during a horse racing event of the 18th Mount Qomolangma culture and tourism festival in Xigaze, southwest China's Tibet Autonomous Region on June 20, 2023. (Photo by Sun Fei/Xinhua News Agency/Alamy Live News)

Members of a Chinese opera take a selfie before a performance at a shopping mall ahead of the Chinese Lunar New Year celebrations in Bangkok, Thailand, February 4, 2016. (Photo by Athit Perawongmetha/Reuters)

A woman wearing a Red Army uniform dances at the Bund at midnight on June 1, 2022 in Shanghai, China. Shanghai will fully restore the normal order of production and living starting from Wednesday. (Photo by Zheng Xianzhang/VCG via Getty Images)

A woman rides her scooter as a dog chases her during heavy snowfall in Huai'an, in eastern China's Jiangsu province on February 4, 2024. (Photo by AFP Photo/China Stringer Network)

A woman dressed in a traditional Ukrainian embroidered shirt holds her cat as she take part in an embroidered shirt parade in central Kiev, Ukraine, May 27, 2017. (Photo by Gleb Garanich/Reuters)

Aegean airlines air hostesses take selfies after a news conference in Athens, Wednesday, March 28, 2018. In a deal worth up to $5 billion, Greek airline Aegean says it will buy 30 new Airbus aircraft, with the option of an additional 12, to upgrade its fleet as the country expects to break tourism records. The signing of the final purchase agreement is expected in June. (Photo by Petros Giannakouris/AP Photo)

Folk artists perform at an local opera ahead of Lantern Festival to celebrate Lunar New Year, in Tianshui, Gansu province, China, February 10, 2017. (Photo by Reuters/Stringer)

On the western side of Mount Hood lies the longest glacier cave system in the contiguous United States. In 2012, these caves were mapped to a combined length of 7,166.8 feet by cave explorers Brent McGregor and Eddy Cartaya. Currently, the total passage length is hundreds of feet less. Glaciers are frozen rivers; they are always moving and changing... (Photo and caption by Josh Hydeman)