Vietnam’s Son Doong cave, the largest in the world, could hold a 40-story skyscraper inside. The pristine ecosystem has its own river and jungle. Despite its size, Son Doong wasn’t discovered until 1991. It was lost again for nearly two decades and was fully explored for the first time in 2009. (Photo by Jason Speth/HuffPost)

This photo taken on July 19, 2020 shows a person taking photos while water is released from the Three Gorges Dam, a gigantic hydropower project on the Yangtze river, to relieve flood pressure in Yichang, central China's Hubei province. Rising waters across central and eastern China have left over 140 people dead or missing, and floods have affected almost 24 million since the start of July, according to the ministry of emergency management. (Photo by AFP Photo/China Stringer Network)

A dancer of Potosi's government departament, poses with traditional costumes at the Salar de Uyuni, the world's largest salt flat, in Uyuni, Bolivia, on November 7, 2020. (Photo by Ronaldo Schemidt/AFP Photo)

A person practices ski-joering at the Avoriaz resort in the French Alps on February 11, 2021. (Photo by Jeff Pachoud/AFP Photo)

Woman enjoying the sun on one of Maui's black sand beaches, Hawaii, United States of America, North America on February 25, 2022. (Photo by Laura Grier/Robert Harding RF via AFP Photo)

A woman takes a picture as a super moon, known as the Blue Moon, rises above Ciudad Juarez, Mexico on August 30, 2023. (Photo by Jose Luis Gonzalez/Reuters)

A giraffe appears almost to be doing the splits as it bends to drink at a watering hole on a reserve in Mkuze, South Africa in September 2023. (Photo by Peter Batty/Solent News)

A hiker walks in the Zillertal Alps during an autumn day near the village of Ginzling, Austria, October 15, 2019. (Photo by Lisi Niesner/Reuters)