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)

Ellesse Janda welcomes a spring rainbow at Cresswell in Northumberland, United Kingdom on March 17, 2023. (Photo by Ian Sproat/Picture Exclusive)

Ukrainian soldiers fire the D-30 artillery to Russian positions in the direction of Klishchiivka as the Russia-Ukraine war continues in Donetsk Oblast, Ukraine on August 12, 2023. (Photo by Diego Herrera Carcedo/Anadolu Agency via Getty Images)

Waxwings in Balham south London on December 31, 2023. There has been a huge influx of this erruptive species this year. This probably due to severe storms and a shortage of food in their native Scandinavia in the Autumn. (Photo by Jack Hill/The Times)

A Palestinian man walks on the beach, as storm winds blow, near a camp for internally displaced on the beach near the Nuseirat refugee in the central Gaza Strip on December 20, 2024, amid the continuing war between Israel and Hamas. (Photo by Eyad Baba/AFP Photo)

American singer-songwriter Chappell Roan performs during her “Midwest Princess Tour” at the Brixton Academy on September 21, 2024 in London, England. (Photo by Jim Dyson/Getty Images)

A severe thunderstorm hits Omaha, Neb., on Wednesday, June 12, 2024. (Photo by Chris Machian/Omaha World-Herald via AP Photo)

Aeronautics and Space engineer at France's Compagnie Maritime d'Expertises, or Comex, Arnaud Prost (C) meets with a jogger as he tests on the ground the “Gandolfi 2” underwater training suit for spacewalk, on January 20, 2016 in the calanques region (rocky inlets) of Marseille. The underwater training suit “Gandolfi 2”, developed with the European Space Agency (ESA), is designed for training astronauts underwater to simulate space gravity for the astronaut's extravehicular activities (EVAs). (Photo by Boris Horvat/AFP Photo)