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)

Sunset on Monday evening, June 17, 2024 at Mudeford in Dorset, UK with a swan stretching it's wings. (Photo by Cenk Albayrak-Touye/Picture Exclusive)

The sun sets over the Mediterranean sea as a nine-branched Hanukkah menorah (Hanukkiah) is pictured by the coast in Netanya on December 31, 2024. (Photo by Jack Guez/AFP Photo)

An aerial view shows the the Mountain Bike course at the X-Park at Deodoro Olympic Park ahead of the 2016 Rio Olympics in Rio de Janeiro, Brazil, July 16, 2016. (Photo by Ricardo Moraes/Reuters)

American actress, model, singer and activist Paris Jackson attends Comic-Con in San Diego, California, USA on July 21, 2018. (Photo by @parisjackson/Instagram)

People take pictures of the sunset in Berlin October 27, 2014. (Photo by Hannibal Hanschke/Reuters)

Groundsman Darren Cordingley on his way out of the maze on July 11, 2024. Gardeners have had their work cut out after spending a whopping 520 hours trimming one of the world's biggest hedge mazes. It has taken a team of 13 working eight hours a day for five days to tackle the enormous maze at the Longleat estate in Wiltshire, UK. (Photo by Max Willcock/Bournemouth News)

A woman crosses a road outside the EU Parliament ahead of the EU elections in Brussels, Belgium, May 22, 2019. (Photo by Yves Herman/Reuters)