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)

The Queen Elizabeth Tower (Big Ben) is reflected in a puddle as a cyclist rides by in London, on 27 June 2016. Britain began preparations to leave the European Union on Monday but said it would not be rushed into a quick exit, as markets plunged in the wake of a seismic referendum despite attempts to calm jitters. (Photo by Leon Neal/AFP Photo)

New Forest ponies graze as the sun rises over Godshill in the New Forest, Hants on September 18, 2022, on the day before the Queen's state funeral tomorrow. (Photo by Claire Sheppard/Solent News & Photo Agency)

Two ruddy shelducks fly under a double rainbow in Odisha, India in July 2022. These birds are ruddy shelduck, known locally as the Brahminy duck. They have a wingspan of between 43 and 53 inches and stand at a maximum of 28 inches tall. (Photo by Suman Das/Media Drum Images)

An incredible moon rise behind the World Trade Center, Manhattan, New York on August 23, 2016. The breath-taking photo was taken by photographer Jennifer Khordi. She said: it was just absolutely amazing to see this. (Photo by Jennifer Khordi/Caters News Agency)

A pitch invader during the 2018 FIFA World Cup Final between France and Croatia at Luzhniki Stadium on July 15, 2018 in Moscow, Russia. p*ssy Riot claimed responsibility for the pitch invasion, tweeting: “Just a few minutes ago four p*ssy Riot members performed in the FIFA World Cup final match – «Policeman enters the Game»”. (Photo by Darren Staples/Reuters)

People with a South Korean flag waves as fireworks get off outside the stadium during the opening ceremony of the Pyeongchang 2018 Winter Olympic Games at the Pyeongchang Stadium on February 9, 2018. (Photo by Martin Bernetti/AFP Photo)

A wax figure of U.S. actress Scarlett Johansson stands outside Madame Tussauds New York attraction shortly after the figure was unveiled in Times Square in New York, July 30, 2015. (Photo by Mike Segar/Reuters)