Yukon River viewed from the Midnight Dome, Dawson City, Yukon, Canada (© Robert Postma/Getty Images)

Reflections on Crummock Water in the Lake District, Cumbria, England (© Damian Harrison/Alamy)

A thunderstorm rolls across the Theodore Roosevelt National Park in North Dakota (© Judith Zimmerman/Danita Delimont)

瓦勒玛丽附近草原国家公园中的草原狐幼崽，加拿大萨斯喀彻温省 (© John E Marriott/age fotostock)

威斯康星州贝菲尔德附近的阿波斯特尔群岛国家湖岸，一只皮划艇正在探索砂岩海蚀洞 (© Chuck Haney/Danita Delimont)

Kayaker exploring sandstone sea caves in Apostle Islands National Lakeshore near Bayfield, Wisconsin (© Chuck Haney/Danita Delimont)

White storks at Los Barruecos Natural Monument, Cáceres, Spain (© Wild Wonders of Europe/Widstrand/Minden Pictures)

Cape Neddick Light in York, Maine (© Haizhan Zheng/Getty Images)

Male leopard in Linyanti Wildlife Reserve, Botswana (© Karine Aigner/Tandem Stills + Motion)

Seville, Spain’s Guadalquivir River and Triana Bridge (© Zu Sanchez Photography/Getty Images)

A thunderstorm rolls across the Theodore Roosevelt National Park in North Dakota, USA (© Judith Zimmerman/Danita Delimont)

Shepherd with flock of sheep at dawn, Thar desert (© Laurent Geslin/Minden Pictures)

Mars Express image of the icy cap at Mars’ south pole (© ESA/DLR/FU Berlin/Bill Dunford)

雄性和雌性的匹诺曹蜥蜴，厄瓜多尔明多 (© James Christensen/Minden Pictures)

斯默根，瑞典 (© Martin Wahlborg/Getty Images Plus)

Blick vom Midnight Dome auf den Yukon River, Dawson City, Yukon, Kanada (© Robert Postma/Getty Images)

马格达伦群岛洞穴内部，加拿大魁北克 (© Virginie Fréchette/Getty Images)

The Dubai Fountain in Burj Lake taken from the Burj Khalifa in Dubai (© Eli Asenova/Getty Images)

Lake Schliersee, Bavaria, Germany (© Rüdiger Hess/geo-select FotoArt)

Wildebeest herd crossing the Mara River between Kenya and Tanzania (© zhengvision/Getty Images)

哈利法塔湖中的迪拜喷泉，迪拜哈利法塔 (© Eli Asenova/Getty Images)

Farmland in USA's Palouse region (© Art Wolfe/Getty Images)

卡特迈国家公园里的棕熊，阿拉斯加州 (© imageBROKER/SuperStock)

Satellitenbild des Burning Man-Festivals in Black Rock City, Nevada, USA (© DigitalGlobe/ScapeWare3d/Getty Images)

Royal Albert Hall during the annual BBC Proms festival in London (© Oli Scarff/Getty Images)

Rose-ringed parakeets in National Chambal Gharial Wildlife Sanctuary, Madhya Pradesh, India (© Pete Oxford/Minden Pictures)

科尼西宫的花园，佛罗伦萨 (© Will Perrett/Alamy)

The Gardens of the Palazzo Corsini al Prato in Florence, Italy (© Will Perrett/Alamy)

Asbury Park in New Jersey, USA (© Patrick Morisson/Alamy)

Neuwerk Island seen from Cuxhaven, Lower Saxony, Germany (© Michael Dittel/EyeEm/Getty Images)

Slacklining between giant boulders in Bishop, California (© Evgeny Vasenev/Aurora Photos)