Arenal Volcano seen from Monteverde, Costa Rica (© Kevin Wells/Getty Images)

Jöriseen lakes in the Silvretta Alps, Switzerland (© Florin Baumann/Getty Images)

Wildebeests in the Maasai Mara, Kenya (© Matt Polski/Getty Images)

Mayan ruins in Tikal, Guatemala (© THP Creative/Getty Images)

Church of Nuestra Señora de los Remedios and Popocatépetl, Puebla, Mexico (© Radius Images/Shutterstock)

Royal azaleas in bloom on Hwangmaesan Mountain, South Korea (© Stock for you/Shutterstock)

Seal pup, Lundy Island, England (© Henley Spiers/Minden Pictures)

Delicate Arch, Arches National Park, Utah (© Mark Brodkin Photography/Getty Images)

Backlight sunrays at Jim Corbett National Park (© Swapan Banik/Alamy Stock Photo)

Cordouan Lighthouse, Royan, Charente, France (© FRTimelapse/Getty Images)

Henningsvær Stadium, Norway (© Morten Falch Sortland/Getty Images)

Henningsvær Stadion, Norway (© Morten Falch Sortland/Getty Images)

Pelicans at Sonny Bono Salton Sea National Wildlife Refuge, California (© David McNew/Getty Images)

Waterfall in Meghalaya, India (© Indranil Aditya/Alamy Stock Photo)

Morro Jable and Playa del Matorral, Fuerteventura, Canary Islands, Spain (© Gavin Hellier/Getty Images)

Canoe paddling in Okefenokee National Wildlife Refuge, Georgia (© Brad Beck/Tandem Stills + Motion)

Natural Bridges State Beach in Santa Cruz, California (© Jim Patterson/Tandem Stills + Motion)

Museo Soumaya, Plaza Carso building, Mexico City, Mexico (© Juan Romero/Alamy)

Sumatran rhinoceros, Way Kambas National Park, Indonesia (© Cyril Ruoso/Minden Pictures)

European honeybees in Sheffield, England (© Deborah Vernon/Alamy)

River Seine, Paris, France (© StockByM/Getty Images)

Coffee plantations, Kerala, India (© Hari Mahidhar/Shutterstock)

The Old Fortress of Corfu, Greece (© Netfalls Remy Musser/Shutterstock)

The North Atlantic island village of Saksun (© miroslav_1/Getty Images)

Wat Sri Sawai in Sukhothai Historical Park, Thailand (© Casper1774 Studio/Shutterstock)

Plant life in Namibia (© Fotofeeling/DEEPOL by plainpicture)

Tegalalang terrace farms in Ubud, Indonesia (© Cavan Images/Adobe Stock)

Ripening mangoes on a tree, India (© Tim Gainey/Alamy Stock Photo)

Playa del Amor, Marietas Islands, Puerto Vallarta, Mexico (© ferrantraite/Getty Images)

Sea otter pup, Prince William Sound, Alaska (© Donald M. Jones/Minden Pictures)

Aerial image of the Great Barrier Reef, Australia (© AirPano LLC/Amazing Aerial Agency)