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)

Gray whale feeding at the surface and showing it's baleen. (Photo by Christopher Swann/Biosphoto)

The winner of the Miss Tattoo Brazil 2014 contest, Bruna Barros, shows a tattoo that says 'My body, my rules' during Tattoo Week, the largest convention of art in the skin of Latin America, in Sao Paulo, Brazil, 14 July 2017. A tattooed woman beauty pageant, the new trends and techniques of the tattoo world, body piercing and the environment of the art of definitively painting the body, are all due to be addressed during the seventh edition of the “Tattoo Week Sao Paulo“. (Photo by Sebastiao Moreira/EPA)

Boeing 747-400 of KLM in approach for the “Princess Juliana” airport, Netherlands Antilles Sint Maarten on July 2, 2002. (Photo by LUPOO/Ullstein Bild via Getty Images)

The bride in her room, prepared for a traditional Chechen wedding ceremony in Grozny, Chechnya, Russia on November 24, 2016. (Photo by Valery Sharifulin/TASS)

A Parisian dances at the installation Electronica, a unique look at the great classics of 20th century electronic music, played under the vaults at the Collège des Bernardins part of Nuit Blanche, an annual evening festival of culture and art on October 03, 2020 in Paris, France. Scaled down this year because of the Covid-19 pandemic, the festival is split across the left and right banks of the city with many outdoor exhibitions to enable social distancing. (Photo by Kiran Ridley/Getty Images)

A cat sits in front of a retro car owned by retired mechanic Mikhail Krasinets at an open-air museum of Soviet-era vehicles in the village of Chernousovo, Tula region, Russia on September 27, 2018. In the remote village of Chernousovo, retired mechanic Mikhail Krasinets tends to more than 300 ramshackle, Soviet-era cars, remnants of a once vibrant auto industry that crumbled with the fall of the Soviet Union. (Photo by Maxim Shemetov/Reuters)

A Kenyan model Ajuma Nasanyana waits behind the scenes before the fashion show showcasing African fashion and culture during a gala marking the launch of a book called “African Twilight: The Vanishing Rituals and Ceremonies of the African Continent” at the African Heritage House in Nairobi, Kenya on March 3, 2019. (Photo by Baz Ratner/Reuters)