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)

Doesn’t taking a nap in a hammock outdoors sound lovely? Perhaps not when you’re hanging in the air, thousands of feet above ground, between two mountains in the Italian Alps! Which is exactly what these adventurous folks did during the International Highline Meeting in Monte Piana, Italy. (Photo by Sebastian Wahlhuetter Photography)

Riot police walk in the street as a couple kiss on June 15, 2011 in Vancouver, Canada. Vancouver broke out in riots after their hockey team the Vancouver Canucks lost in Game Seven of the Stanley Cup Finals. (Photo by Rich Lam/Getty Images)

A man walks along a corridor at a hotel in Singapore on February 7, 2024. (Photo by Edgar Su/Reuters)

A model presents a creation made with chocolate by designer Wang Jingzhi and Maitre Chocolatier Roberto Rinaldini during the international exhibition of chocolate “Salon du Chocolat” in Milan, Italy, February 12, 2016. (Photo by Stefano Rellandini/Reuters)

Australia's Nina Kennedy competes in the women's pole vault final at a Diamond League event in Florence, Italy on June 2, 2023. (Photo by Remo Casilli/Reuters)

A Cameroon fan waits for the start of the Qatar 2022 World Cup Group G football match between Switzerland and Cameroon at the Al-Janoub Stadium in Al-Wakrah, south of Doha on November 24, 2022. (Photo by Hannah Mckay/Reuters)

Poland's Adrian Meronk, left, celebrates with his partner Melania Bobrowicz during the Australian Open golf championship at Victoria golf course in Melbourne, Australia, Sunday, December 4, 2022. (Photo by Asanka Brendon Ratnayake/AP Photo)