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)

French mounted bullfighter Lea Vicens is gored by her first bull and falls off her horse during the 31st day of the San Isidro bullfighting festival at Las Ventas bullring in Madrid, Spain, 10 June 2017. (Photo by Victor Lerena/EPA)

Musician Jerome Gamble plays guitar to accompany the recorded music as it is played to the city below on September 01, 2020 in Bristol, England. Created by Bristol-based artist Luke Jerram and composer Dan Jones, “Sky Orchestra – A Moment in Time” was first performed at the Bristol International Balloon Fiesta in 2003. (Photo by Finnbarr Webster/Getty Images)

Members of the Texas Dancin' Divas take part in the Juneteenth Parade in Galveston, Texas, U.S., June 19, 2021. The United States marked Juneteenth for the first time as a federal holiday commemorating the end of the legal enslavement of Black Americans. (Photo by Adrees Latif/Reuters)

A butcher blows into the skin of a cow's leg in order to peel it off, on the first market day since the earthquake in Camp Perrin, Haiti, Friday, August 20, 2021, six days after a 7.2 magnitude quake. (Photo by Fernando Llano/AP Photo)

Rosita, a character from the children's television series Sesame Street, gestures in front of Abraham Lincoln's portrait, during an event with children hosted by U.S. first lady Jill Biden of as part of the Christmas decoration and holiday reception kickoff at the White House, in Washington, U.S., November 29, 2021. (Photo by Jonathan Ernst /Reuters)

A nurse bows to the life size statue of Pope Francis as her friend takes a photograph at the St.Louis hospital in Bangkok, Thailand, Tuesday, November 19, 2019. Pope Francis arrives in Thailand on Wednesday for the first visit here by the head of the Roman Catholic Church since St. John Paul II in 1984. (Photo by Manish Swarup/AP Photo)

Workers fold up a billboard to prepare for the coming of typhoon Vongfong, in Manila, Philippines on Thursday May, 14, 2020. The first typhoon to hit the country this year roared toward the eastern Philippines on Thursday as authorities work to evacuate tens of thousands of people while avoiding overcrowding in shelters that could spread the coronavirus. (Photo by Aaron Favila/AP Photo)