Marmot with the peak of Grossglockner in the background, Austria (© SeppFriedhuber/Getty Images)

Onkaparinga River, Port Noarlunga, South Australia (© plainpicture/AWL/Marco Bottigelli)

Sandstone formation and pools of water in 'The Wave', Paria Canyon-Vermilion Cliffs National Monument, Arizona, USA (© Dennis Frates/Alamy)

Sandstone formation and pools of water in 'The Wave,' Paria Canyon-Vermilion Cliffs National Monument, Arizona (© Dennis Frates/Alamy)

Dusk over a marina in Sandy Bay, Hobart, Tasmania (© Jochen Schlenker/Masterfile)

Great grey owls in Montreal, Canada (© rollandgelly/Getty Images)

Moon dog photographed at Hug Point Falls on the Oregon coast, USA (© Ben Coffman/Tandem Stills + Motion)

Nieve penitente ice formations seen on Agua Negra Pass in the Coquimbo Region of the Andes, Chile (© Art Wolfe/Danita Delimont)

Almond blossoms surround a red barn in California's Central Valley, USA (© Jeffrey Lewis/Tandem Stills + Motion)

Muskox with newborn in the central Arctic coastal plain of Alaska, USA (© Steven Kazlowski/Danita Delimont)

Porto, Portugal (© Kanuman/Shutterstock)

Eastern bluebirds in Charlotte, North Carolina (© Elizabeth W. Kearley/Getty Images)

Ocean waves crashing over a heart-shaped rock island off the coast of Sydney, Australia (© Kristian Bell/Getty Images)

Onkaparinga River, Port Noarlunga, South Australia (© plainpicture/AWL/Marco Bottigelli)

Flowers and an ironwork fence in front of a house in New Orleans, Louisiana (© Lauren Mitchell/Offset by Shutterstock)

Perito Moreno Glacier in Patagonia's Los Glaciares National Park, Argentina (© Juergen Schonnop/Getty Images)

Rocks in the Verzasca River near the hamlet of Lavertezzo in the Valle Verzasca of Switzerland (© Robert Seitz/Offset by Shutterstock)

Parrotfish off the coast of Negros Oriental province, Philippines (© Tim Fitzharris/Minden Pictures)

Clearing snowstorm, Yosemite National Park, California (© Jeff Lewis/Tandem Stills + Motion)

Porto, Portugal (© Kanuman/Shutterstock)

The Cobb breakwater, Lyme Regis, Dorset, England (© Ross Hoddinott/Offset by Shutterstock)

Dalmatian pelicans on ice, Lake Kerkini, Greece (© Guy Edwardes/Minden Pictures)

Le Morne Brabant, Mauritius (© Hemis/Alamy)

Trevi, Umbria, Italy, with almond flowers in the foreground (© Maurizio Rellini/eStock Photo)

Red lanterns hanging in Jinli Street, Chengdu, China (© Philippe LEJEANVRE/Getty Images)

Aerial view of the Ochsenkopf and Schneeberg mountains, Bavaria, Germany (© Felix Meyer/Adobe Stock)

Traditional farmhouses at Skaftafell, Vatnajökull National Park, Iceland (© Jarcosa/Getty Images)