Small lake and marsh in Jasper National Park in Alberta, Canada (© Don White/Getty Images)

Leopard sleeping in a tree in the savannah, Masai Mara National Reserve, Kenya (© Klein & Hubert/Nature Picture Library)

Ksar Ouled Soltane, Tataouine district in southern Tunisia (© Dark_Eni/Getty Images Plus)

Tŵr Mawr Lighthouse, Ynys Llanddwyn, Anglesey, Wales (© Lukas Bischoff/Getty Images)

Kofa National Wildlife Refuge, Arizona, United States (© Denis Tangney Jr/Getty Images)

Sardinian donkey mare and foal, France (© Klein & Hubert/Nature Picture Library)

Skradinski Buk Waterfall in Krka National Park, Croatia (© Amazing Aerial Agency/Adobe Stock)

Polar bear mother and cubs playing in Wapusk National Park, Manitoba, Canada (© Hao Jiang/Getty Images)

Great Barrier Reef from above, Queensland, Australia (© Francesco Riccardo Iacomino/Getty Images)

Atlantic puffins, Wales (© FLPA/Alamy)

Arch and Milky Way, Alabama Hills, Sierra Nevada, California, United States (© Tim Fitzharris/Minden Pictures)

Medieval town of Pitigliano, Tuscany, Italy (© bluejayphoto/Getty Images Plus)

A family of sperm whales, Indian Ocean (© Tony Wu/Nature Picture Library)

Smith Rock State Park, Oregon, United States (© Alex Ratson/Getty Images)

Hawksbill Mountain in Shenandoah National Park, Virginia, USA (© John Baggaley/Getty Images)

Natural History Museum, London, England (© Colm Keating/Tandem Stills + Motion)

Formentor Lighthouse, Mallorca, Balearic Islands, Spain (© Allard Schager/Getty Images)

Bumble bee pollinating, Worcester, England (© SimonEastwood87/Shutterstock)

Tea terraces in Sichuan Province, China (© lzf/Shutterstock)

Kauehi Atoll, Tuamotu Archipelago, French Polynesia (© WaterFrame_dpr/Alamy)

Turtles with butterflies (© Patrick Gallet/Getty Images)

Tre Cime Nature Park, South Tyrol, Italy (© Adisorn Fineday Chutikunakorn/Getty Images)

View over Jaipur from Hawa Mahal, Rajasthan (© byheaven/Getty Images)

Lupine flowers in bloom, Northern California, United States (© Jeffrey Lewis/Tandem Stills + Motion)

Sea otter, Kachemak Bay, Homer, Alaska, United States (© roclwyr/Getty Images)

Old city wall of Hwaseong Fortress, Suwon, South Korea (© aomam/Getty Images)

Mount Everest summit, Sagarmatha National Park, Nepal (© fotoVoyager/Getty Images)

Plains zebra foal in Etosha National Park, Namibia (© Sharon Heald/Nature Picture Library)

Highway through Xitai Jinaier Lake, Qinghai Province, China (© Kaicheng Xu/Getty Images)

Palermo skyline, Sicily, Italy (© Sean Pavone/Getty Images)