Poenari Castle on Mount Cetatea, Făgăraș Mountains, Romania (© porojnicu/Getty Images)

Korean Bell of Friendship, Los Angeles (© Carlos Marin/Getty Images)

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

Wildebeests in the Maasai Mara National Reserve, 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)

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

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

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

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

Wild lupines in bloom (© silverjohn/Getty Images Plus)

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

White-tailed deer doe and newborn fawn, Montana (© Donald M. Jones/Minden Pictures)

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

Canoeing 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, Mexico City, Mexico (© Juan Romero/Alamy)

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

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

Pont d’Arcole on the Seine river, Paris, France (© StockByM/Getty Images)

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

Western box turtle (© Tim Fitzharris/Minden Pictures)

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

Saksun, Faroe Islands, Denmark (© miroslav_1/Getty Images)

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

Quiver trees in Namibia (© Fotofeeling/DEEPOL by plainpicture)

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

Lantern floating ceremony, Ala Moana Beach Park, Honolulu, Hawaii (© Naomi Hayes of Island Memories Photography/Getty Images)

Playa del Amor in the Marietas Islands, off the coast of Puerto Vallarta, Mexico (© ferrantraite/Getty Images)

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