Tree tower in Bavarian Forest National Park, Neuschönau, Germany (© imageBROKER/Alamy)

巴伐利亚森林国家公园的树梢步道，德国诺伊舍瑙 (© imageBROKER/Alamy)

阿尔塞多火山上的象龟，加拉帕戈斯群岛 (© Tui De Roy/Minden Pictures)

胡德山国家森林里的延龄草湖，俄勒冈州 (© Frank Krahmer/Getty Images)

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

Aerial view of Elk Falls suspension bridge on Vancouver Island, Canada (© Ink Drop/Alamy)

温哥华岛麋鹿瀑布吊桥鸟瞰图，加拿大 (© Ink Drop/Alamy)

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

博茨瓦纳卡拉哈里沙漠中的狐獴 (© Aluma Images/Getty Images)

The Skywalk on the Rock of Gibraltar (© Stephen Ball/Alamy)

Giant karri tree at the entrance to a cave in the Margaret River area, Western Australia (© Posnov/Getty Images)

Saint-Pierre at sunrise, Saint Pierre and Miquelon (© Henryk Sadura/Getty Images)

日出时分的圣皮埃尔全景，加拿大圣皮埃尔和密克隆 (© Henryk Sadura/Getty Images)

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

Narrenwindmühle (Fool's Mill) windmill, Dülken, Germany (© dpa picture alliance/Alamy)

A red fox in the grass (© Frederic Desmette/Minden Pictures)

Mount Fuji and Ushitukiiwa (twin rocks), Matsuzaki, Japan (© Tommy Tsutsui/Getty Images)

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

Waterperry花园，英国牛津郡 (© Lauren Hibbit/Danita Delimont)

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

Earth at night (© NASA)

Earth at night (© NASA)

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

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

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

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)

圣帕特里克岛上的皮尔城堡，马恩岛 (© Massimo Ripani/SIME/eStock Photo)

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

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

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