Adélie penguins in Antarctica (© David Merron Photography/Getty Images)

Javan tree frog (© kuritafsheen/Getty Images)

Bromo Tengger Semeru National Park, East Java, Indonesia (© Bento Fotography/Getty Images)

Pu'uhonua o Honaunau National Park, Big Island, Hawaii (© Westend61/Getty Images)

Roman bridge, Cordoba, Spain (© Jeremy Woodhouse/Getty Images)

Black grouse males in Kuusamo, Finland (© Markus Varesvuo/Minden Pictures)

Moon rising, Tucson, Arizona, USA (© Tim Murphy/Shutterstock)

Eurasian baby beavers, Finland (© Danny Green/Minden Pictures)

Giant's Causeway, Northern Ireland, United Kingdom (© DieterMeyrl/Getty Images)

Aurora at Two Jack Lake, Banff National Park, Alberta, Canada (© Jesús M. García/Getty Images)

Elephants in Amboseli National Park, Kenya (© Diana Robinson/Getty Images)

Columbia River Gorge, Oregon, USA (© Chase Dekker Wild-Life Images/Getty Images)

Earth from the International Space Station (© Tim Peake/ESA/NASA via Getty Images)

Snowdonia National Park, Gwynedd, Wales, UK (© Sebastian Wasek/eStock Photo)

Red sea stars, Mediterranean Sea (© Hans Leijnse/Minden Pictures)

Aerial view of Jaipur from Nahargarh Fort in Rajasthan, India (© Sean3810/iStock/Getty Images Plus)

Adelaide International Kite Festival, Australia (© Andrey Moisseyev/Alamy)

Petit Minou Lighthouse, Plouzané, Brittany, France (© RooM the Agency/Alamy)

Machu Picchu, Peru (© Dora Dalton/Getty Images)

Taiwan yuhina, Alishan National Scenic Area, Taiwan (© Staffan Widstrand/Minden Pictures)

Anjuna Beach, Goa, India (© Dmitry Rukhlenko/Shutterstock)

Procida, Italy (© Sean Pavone/Shutterstock)

Island fox in Channel Islands National Park, California, USA (© Ian Shive/Tandem Stills + Motion)

Sunrise over misty lavender fields, India (© Amith Nag Photography/Getty Images)

Bavarian Forest wine cellar, Germany (© Andreas_Zerndl/Getty Images)

Great horned owl fledglings (© Michael Morse/Getty Images)

South Padre Island, Texas, USA (© Jeff R Clow/Getty Images)

Mariposa Grove in Yosemite National Park, California, USA (© Orbon Alija/Getty Images)

Milky Way over Joshua Tree National Park, California, USA (© Schroptschop/Getty Images)

Temple E at Selinunte, Sicily, Italy (© Antonino Bartuccio/eStock)