Tianmen Mountain is a mountain located within Tianmen Mountain National Park, Zhangjiajie, in northwestern Hunan Province, China.

Most pet cats will become timid or defensive when outdoors, but not Millie – after being adopted by her mountain-climbing owner Craig Armstrong, Millie has become a feline hiking and mountain-climbing legend.

In this May 24, 2016 photo, a young boy descends the Qullqip'unqu mountain looking out at the tens of thousands of pilgrims gathered to celebrate the three-day festival Qoyllur Rit’i, translated from the Quechua language as Snow Star, in the Andean Sinakara Valley, in Peru's Cusco region. The celebration that mixes Catholic and indigenous beliefs honors Jesus as well as the area’s glacier, which is considered sacred among some indigenous people. While the native celebration is far older, the Christian part of the ritual stretches back to the 1700s, when Jesus is said to have appeared to a young shepherd in the form of another boy. (Photo by Rodrigo Abd/AP Photo)

A building emerges from the early morning fog in Belvedere farm in San Quirico d'Orcia, Tuscany, Italy. The beautiful pictures were taken by Alberto Di Donato who has a huge passion for the Tuscan landscape and is inspired by the Renaissance artists who painted the same landscapes. (Photo by Alberto Di Donato/HotSpotMedia)

This undated photo shows the Arctic National Wildlife Refuge in Alaska. (Photo by U.S. Fish and Wildlife Service/Getty Images)

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)

Andrew Ling's inspiring photographs showcase the splendor of the natural world, using people to highlight the beauty and scale of these epic landscapes. Each image features a person photographed from hundreds of feet away, seemingly insignificant in comparison to the breathtaking landscape that surrounds them – whether beneath gushing waterfalls, under millions of glittering stars or atop of gigantic cliffs. Andrew, 22, said, “I hope these images will help remind people how beautiful the world we live in is”. Here: Second Beach, La Push, Washington, March, 2015. (Photo by Andrew Ling/Caters News)