Meet the star students of orangutan school – the unique rehab centre where orphaned apes are taught how to climb trees and survive in the wild without their mum and dad. (Photo by Caters News)

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)

Thai officials arrive for morning alms as part of celebrations for the 68th birthday of Thai King Maha Vajiralongkorn Bodindrade​bayavarangkun, at Sanam Luang in Bangkok, Thailand, 28 July 2020. (Photo by Diego Azubel/EPA/EFE)

Bella Hadid and Gigi Hadid prepares backstage for Savage X Fenty Show Presented By Amazon Prime Video – Backstage at Barclays Center on September 10, 2019 in Brooklyn, New York. (Photo by Ilya S. Savenok/Getty Images for Savage X Fenty Show Presented by Amazon Prime Video)

Wrestlers perform during an all-female wrestling event on International Women's Day at the Resistance Gallery in Bethnal Green on March 8, 2019 in London, England. (Photo by Jack Taylor/Getty Images)

A photo from Madonna’s high school yearbook at her childhood home in Rochester, Michigan, circa 1973. (Photo by Rebel Images/Rex Features/Shutterstock)

Hindu women worship the Sun god in the polluted waters of the river Yamuna during the Hindu religious festival of Chatth Puja in New Delhi, India, November 3, 2019. (Photo by Adnan Abidi/Reuters)