Rainbow at Victoria Falls in Zambia (© Dietmar Temps/Shutterstock)

Pronghorn buck (© Donald M. Jones/Minden Pictures)

Green tree frog and purple water lily, Lake Kissimmee, Florida (© Joanne Williams/Danita Delimont)

Cherry blossoms and Himeji Castle in Himeji, Japan (© Tororo/Getty Images)

Aerial view of Santorini island, Greece (© Amazing Aerial Agency/Offset)

The April full moon, or pink moon, rises over St Michael's Mount, Cornwall, England (© Simon Maycock/Alamy Live News)

A pod of narwhals near Baffin Island, Nunavut, Canada (© Eric Baccega/Minden Pictures)

A Kermode bear cub huddling with its sibling in Canada's Great Bear Rainforest, British Columbia (© Ian McAllister/Offset)

Ancient Roman gold mining site of Las Médulas, León, Spain (© DEEPOL by plainpicture/David Santiago Garcia)

Easter decorations at Alexanderplatz, Berlin (© plainpicture/Christian Reister)

Floating temples of Wat Chaloem Phra Kiat Phrachomklao Rachanusorn in Lampang province, Thailand (© pa_YON/Getty Images)

Pantropical spotted dolphins off the coast of Ixtapa, Mexico (© Christian Vizl/Tandem Stills + Motion)

Artist Laura Buckley with her video installation 'Fata Morgana', Saatchi Gallery, London (© Stephen Chung/Alamy)

Sipapu Bridge in Natural Bridges National Monument, Utah (© Fyletto/Getty Images)

Ruffed grouse in Algonquin Provincial Park, Ontario, Canada (© Jim Cumming/Getty Images)

Vernal Fall in Yosemite National Park, California (© elvistudio/Shutterstock)

Milky Way over Neist Point Lighthouse, Isle of Skye, Scotland (© Shaiith/Getty Images)

Keukenhof in Lisse, Netherlands (© Jim Zuckerman/Getty Images)

Summer storm from City Beach, Perth (© JohnCrux/Getty Images)

Te Matua Ngahere, a giant kauri tree growing in Waipoua Forest, Northland, New Zealand (© Kim Westerskov/Getty Images)

Male king eider ducks swimming in Troms og Finnmark, Norway (© Pal Hermansen/Minden Pictures)

The Large Magellanic Cloud, photographed by the Hubble Space Telescope (© ESA/Hubble/NASA)

An ANZAC Soldier statue in the evening light (© t_rust/iStock/Getty Images Plus)

Southern rockhopper penguins on the Falkland Islands (© Heike Odermatt/Minden Pictures)

Sunset at Ruby Beach in Olympic National Park, Washington state (© Adam Mowery/Tandem Stills + Motion)

Salisbury Cathedral with grazing flock of sheep, England (© Slawek Staszczuk Photo/Alamy)

A tractor kicks up dust while tilling fields on the Palouse near Pullman, Washington (© Ben Herndon/Tandem Stills + Motion)

Arctic redpoll nest in Lapland, Finland (© Maximilian Buzun/Alamy)

Altdahn Castle near Dahn, Dahner Felsenland (Dahn Rockland), Palatinate Forest, Rhineland-Palatinate, Germany (© Reinhard Schmid/Huber/eStock Photo)