Writing-On-Stone Provincial Park/Áísínai'pi, Alberta (© Philippe Widling/Getty Images)

Two Old World swallowtail butterflies on a flower (© Alberto Ghizzi Panizza/Getty Images)

Southern cassowary father with chicks, Kuranda, Queensland, Australia (© Martin Willis/Minden Pictures)

Surfers catching waves at Palm Beach on the Gold Coast, Queensland, Australia (© Darren Tierney/Getty Images)

Balsamroot wildflowers bloom below the Teton Mountains in Grand Teton National Park, Wyoming (© Mike Cavaroc/Tandem Stills + Motion)

Seungseon Bridge at Seonam Temple in Jogyesan Provincial Park, South Korea (© Aaron Choi/Getty Images)

Great Smoky Mountains National Park, Tennessee (© Tony Barber/Getty Images)

The Metropolitan Museum of Art in New York City (© Susanne Pommer/Shutterstock)

Elephant walking in the Okavango River, Botswana (© Markus Pavlowsky/Getty Images)

Cliffs of the Sierra Ponce and Rio Grande River, Big Bend National Park, Texas (© Tim Fitzharris/Minden Pictures)

Misool Island, one of the four major islands in the Raja Ampat Islands in West Papua, Indonesia (© Elsy Saldek/Getty Images)

A close-up of the red trillium flower in Algonquin Provincial Park, Ont. (© Jaynes Gallery/Danita Delimont)

Sweetheart Abbey, Dumfries and Galloway, Scotland (© Westend61/Getty Images)

Long-beaked common dolphin pod and diving Cape gannets hunting Pacific sardines off the Eastern Cape, South Africa (© Pete Oxford/Minden Pictures)

Haaga Rhododendron Park, Helsinki, Finland (© Samuli Vainionpää/Getty Images)

An indigo bunting at the John James Audubon Center at Mill Grove in Audubon, Pennsylvania (© Vicki Jauron/Getty Images)

Rapa Valley in Sarek National Park, Sweden (© Alena Vishina/Alamy)

Aerial view of Clayoquot Sound and the Pacific Rim National Park Reserve in British Columbia (© Yuri Choufour/Danita Delimont)

Cycling across a natural rock arch in the desert near Moab, Utah (© Whit Richardson/Cavan)

Buckingham Palace in London, England (© Pajor Pawel/Shutterstock)

Coral reef in Marovo Lagoon in the Solomon Islands (© WaterFrame/Alamy)