A treetop walkway in the Bavarian Forest National Park, Neuschönau, Germany (© imageBROKER/Alamy) - Bing Wallpaper on July 31, 2019

Giant tortoises on Alcedo Volcano in the Galápagos Islands (© Tui De Roy/Minden Pictures)

Trillium Lake in Mount Hood National Forest, Oregon (© Frank Krahmer/Getty Images)

Carhenge, created by Jim Reinders near Alliance, Nebraska (© Charlie Summers/Minden Pictures)

The shoreline of Gandoca-Manzanillo Wildlife Refuge, in Costa Rica (© Greg Basco/Minden Pictures)

Alphorn musicians perform during the International Alphorn Festival in Nendaz, Switzerland (© Fabrice Coffrini/Getty Images)

Jane's Carousel in Brooklyn, New York (© Grzegorz Gill/Shutterstock)

清晨暴雨中的Cathedral，澳大利亚布法罗山 (© Ilya Genkin/Alamy)

Meerkats in the Kalahari Desert in Botswana (© Aluma Images/Getty Images)

Hummingbird hawk-moth feeding on flower, Sardinia, Italy (© patriziomartorana/iStock/Getty Images Plus)

Buckingham Palace and the Victoria Memorial in London for Queen Victoria's bicentennial year (© CTC Creative/Offset)

Artist Luke Jerram's installation 'Museum of the Moon' at Liverpool Cathedral, England (© Christopher Furlong/Getty Images)

Garden of the Gods Park in Colorado Springs, Colorado (© lightphoto/iStock/Getty Images)

Waterperry Gardens in Oxfordshire, England (© Lauren Hibbit/Danita Delimont)

Sheep flock in the Gobi Desert (© Patrick Baz/Getty Images)

The Ernest Hemingway Home and Museum in Key West, for Hemingway Days (© Werner Bertsch/eStock Photo)

Mount Fuji and Ushitukiiwa (Twin Rocks) in Matsuzaki, Japan (© Tommy Tsutsui/Getty Images)

Leatherback sea turtles in Trinidad and Tobago (© Shane P. White/Minden Pictures)

Waterperry Gardens in Oxfordshire, England (© Lauren Hibbit/Danita Delimont)

The cypress tunnel at Point Reyes National Seashore in California (© Rachid Dahnoun/Tandem Stills + Motion)

The cypress tunnel at Point Reyes National Seashore in California (© Rachid Dahnoun/Tandem Stills + Motion)

Visitors on El Caminito del Rey in the province of Málaga, Spain (© Ken Welsh/Alamy)

Jaguar in the Pantanal wetlands, Brazil (© Andy Rouse/Minden Pictures)

Blue walls of Chefchaouen, Morocco (© Tatsuya Ohinata/Getty Images)

Caribou in Kobuk Valley National Park, Alaska (© Staffan Widstrand/Minden Pictures)

Peloton during the 2018 Tour de France in Valence, France (© Justin Setterfield/Getty Images)

巴拉涅卡尔维湾的城堡和要塞，法国科西嘉岛 (© Siephoto/Masterfile)

July 4th fireworks over Lake Union, Seattle (© Onest Mistic/Getty Images)

The Transfăgărășan in Transylvania, Romania (© Calin Stan/Shutterstock)

Solar eclipse sequence from August 21, 2017 (© Lindsay Daniels/Tandem Stills + Motion)

For Canada Day, canoeists in Burnaby, British Columbia, Canada (© Christopher Kimmel/Aurora Photos)