Blue wildebeest herd migrating at sunset, Maasai Mara National Reserve, Kenya (© Denis-Huot/Minden Pictures)

Moraine Lake in Banff National Park, Alberta, Canada (© Schroptschop/Getty Images)

Aerial view of the theater at the ancient city of Hierapolis, adjacent to Pamukkale, Turkey (© Amazing Aerial Agency/Offset by Shutterstock)

Cape foxes in the Kalahari Desert, South Africa (© NSP-RF/Alamy)

Little owl perched on a sunflower, Cadiz, Andalusia, Spain (© Andres M. Dominguez/Minden Pictures)

Great Point Light on Nantucket Island, Massachusetts (© Cate Brown/Cavan Images)

Tolbachik volcanic complex on the Kamchatka Peninsula, Russia (© Egor Vlasov/Shutterstock)

Enhanced-color composite of the Caloris Basin, Mercury (© NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington)

Gray seal pup resting on a beach in Blakeney National Nature Reserve, England (© Kevin Sawford/Getty Images)

American Basin in southern Colorado's San Juan Mountains (© Blaine Harrington III/Alamy)

Danube River near Geisingen, Baden-Württemberg, Germany (© Jochen Knobloch/plainpicture)

Bàu Cá Cái mangrove forest in Quảng Ngãi province, Vietnam (© Robert Harding World Imagery/Offset)

Ežezers Lake in the Latgale region, Latvia (© Eaglewood Films/Nimia)

The Hoh Rainforest in Olympic National Park, Washington state (© Jorge Romano/Offset by Shutterstock)

The Panthéon in Paris, France (© manjik/Shutterstock)

Small tortoiseshell butterfly feeding on flower nectar, Lower Saxony, Germany (© Duncan Usher/Minden Pictures)

North Pacific humpback whale breaching in Frederick Sound, Alaska (© Tony Wu/Minden Pictures)

Happy hot air balloon (© Leonsbox/Getty Images Plus)

Nine-spotted moth in Switzerland (© Thomas Marent/Minden Pictures)

The Grand Canal and Basilica di Santa Maria della Salute in Venice, Italy (© Jim Richardson/Offset by Shutterstock)

Earthrise across Mare Smythii on the moon (© Image Science and Analysis Laboratory, NASA-Johnson Space Center)

The town of Dinant and the River Meuse in Namur province, Belgium (© Kadagan/Shutterstock)

The Giant's Causeway, Bushmills, Northern Ireland, UK (© Chiara Salvadori/Getty Images)

Elephants at Kapama Private Game Reserve in South Africa (© Simon Eeman/Getty Images)

Disko Bay, Ilulissat, Greenland (© Kertu/Shutterstock)

Wheat field in Valladolid, Castilla y León, Spain (© Carlos Javier García Prieto/EyeEm/Getty Images)

Tamul waterfall in the state of San Luis Potosí, Mexico (© Robert Harding World Imagery/Offset by Shutterstock)

Hamelin Pool Marine Nature Reserve in Australia (© Abstract Aerial Art/Getty Images)

Kalsoy Island, one of the Faroe Islands (© Swen Stroop/Getty Images Plus)

Hamerkop standing on a hippo, Mana Pools National Park, Zimbabwe (© David Fettes/Getty Images)

Sand Harbor, Lake Tahoe Nevada State Park, Nevada (© Mariusz Blach/Getty Images Plus)