Ibiza, Balearic Islands, Spain (© tokar/Shutterstock)

Harbour and longtail boats at Ko Samui, Thailand (© Foto2rich/Shutterstock)

African elephant calf playing with its mother, Masai Mara National Reserve, Kenya (© Denis-Huot/naturepl.com)

Purple crocus flowers, Seven Rila Lakes, Bulgaria (© Maya Karkalicheva/Getty Images)

The Wave residential building, Vejle, Denmark (© Frank Bach/Alamy)

Snowy owl near the Canadian Rockies, Canada (© www.harshadventure.com/Getty Images)

Sunrise on the Brocken, Harz National Park, Germany (© imageBROKER/AVTG/Getty Images)

Grey seal sleeping on the beach, Orkney Islands, Scotland (© Andrew Mason/Minden Pictures)

Geothermal blue pool Bláhver at Hveravellir, Iceland (© Juan Maria Coy Vergara/Getty Images)

Peach trees in bloom, Cieza, Murcia, Spain (© Juan Maria Coy Vergara/Getty Images)

Juvenile sunbittern displaying at nest, Ecuador (© Andy Rouse/naturepl.com)

Mute swan with chicks, Hesse, Germany (© Wilfried Martin/Getty Images)

Lanyon Quoit, a Neolithic dolmen in Cornwall, England (© Helen Hotson/Alamy)

Pacific Rim National Park Reserve, Vancouver Island, Canada (© EmilyNorton/Getty Images)

Cable car and Sugarloaf Mountain, Rio de Janeiro, Brazil (© f11photo/Shutterstock)

Grianan of Aileach ring fort, Donegal, Ireland (© Lukassek/Getty Images)

Cherry blossoms at Tom McCall Waterfront Park, Portland, Oregon, USA (© Eric Vogt/Tandem Stills + Motion)

Short-beaked echidna, Adelaide Hills, Australia (© Etienne Littlefair/naturepl.com)

Snowdrops in spring (© klagyivik/Getty Images)

Letea Forest, Danube Delta, Romania (© Wild Wonders of Europe/Widstrand/Nature Picture Library)

Lake Tanganyika, Africa (© BEST-BACKGROUNDS/NASA/Shutterstock)

Lightning storm over saguaro cacti, Sonoran Desert, Arizona, United States (© Jack Dykinga/Nature Picture Library)

Königssee Lake, Bavaria, Germany (© EyeEm Mobile GmbH/Getty Images)

Juvenile manatees in a freshwater spring, Crystal River, Florida, United States (© Gregory Sweeney/Getty Images)

Logan Creek Suspension Bridge, West Coast Trail, British Columbia, Canada (© Tandem Stock/Adobe Stock)

Aurora over Spirit Island on Maligne Lake, Jasper National Park, Alberta, Canada (© Mumemories/Getty Images)

African buffalo, Ngorongoro Crater, Tanzania (© jesuss8/500px/Getty Images)

Peggy's Point Lighthouse, Atlantic Coast, Nova Scotia, Canada (© Prashanth Bala/Shutterstock)

Demoiselle cranes, India (© Axel Gomille/Nature Picture Library)

Paradise Cave, Phong Nha-Ke Bang National Park, Vietnam (© Pakawat Thongcharoen/Getty Images)