Children walk through a field of kochia at Hitachi Seaside Park, Hitachinaka, Japan (© Sankei/Getty Images)(Bing United Kingdom)

Kampa Island, Prague, Czech Republic (© Gianluca Santoni/SIME/4Corners)(Bing United Kingdom)

Silver fern frond, New Zealand (© Alkalyne/Getty Images)(Bing United Kingdom)

Woman walks on west beach, Berneray, Outer Hebrides, Scotland (© Cody Duncan/Aurora Photos)(Bing United Kingdom)

Cap de Formentor, Majorca, Balearic Islands, Spain (© Marcos Molina/Alamy)(Bing United Kingdom)

Arctic fox family, Swedish Lapland (© Staffan Widstrand/plainpicture)(Bing United Kingdom)

Alligator Reef Light in the Florida Keys (© Stephen Frink/Aurora Photos)(Bing United Kingdom)

Sunlight emerging through trees in Sherwood Forest (© Laurence J. Griffiths/Getty Images)(Bing United Kingdom)

Galia melon detail (© Nick Fielding/Alamy)(Bing United Kingdom)

Nienhagen Wood in Mecklenburg-Vorpommern, Germany (© Radius Images/Alamy)(Bing United Kingdom)

A Perseid meteor streaks across the sky over the Lovell Radio Telescope at Jodrell Bank (© Christopher Furlong/Getty Images)(Bing United Kingdom)

Bannack State Park in Montana, USA (© Jeff Kroeze/Gallery Stock)(Bing United Kingdom)

Common myna bird on lily pad in Port Louis, Mauritius (© Getty Images)(Bing United Kingdom)

Agra Fort in Agra, Uttar Pradesh, India (© Bryan Mullennix/Corbis)(Bing United Kingdom)

Atolls in the Maldive Islands (© Sakis Papadopoulos/plainpicture)(Bing United Kingdom)

Rainforest trees burnt by lightning in Daintree National Park, Far North Queensland, Australia (© Peter Adams/plainpicture)(Bing United Kingdom)

Rare cave pearls in Son Doong Cave at Phong Nha-Kẻ Bàng National Park, Vietnam (© Carsten Peter/Getty Images)(Bing United Kingdom)

Photographers shooting pictures of brown bears in Lake Clark National Park and Preserve, Alaska, USA (© Art Wolfe/Mint Images)(Bing United Kingdom)

Pennan, Aberdeenshire, Scotland (© Eichhorst/neuebildanstalt/plainpicture)(Bing United Kingdom)

Mule deer buck in Jasper National Park, Alberta, Canada (© Robert McGouey/All Canada Photos/Corbis)(Bing United Kingdom)

Ko Kut Island, Thailand (© sripfoto/Shutterstock)(Bing United Kingdom)

Langebaan Lagoon and West Coast National Park in South Africa (© Peter Chadwick/Science Photo Library)(Bing United Kingdom)

Porcupines in Glacier National Park, Montana, USA (© D. Robert & Lorri Franz/Aurora Photos)(Bing United Kingdom)

Antique Enamelled Advertising Signs, Portobello Road Market, Notting Hill, London (© Danita Delimont/Getty Images)(Bing United Kingdom)

Poppies and lupine in Los Angeles County, California, USA (© Corbis/age fotostock)(Bing United Kingdom)

Great grey owl (© J. Peltomaeki/age fotostock)(Bing United Kingdom)

Lake Powell, on the border between Utah and Arizona, USA (© AirPano)(Bing United Kingdom)

Floating market vendor near Bangkok, Thailand (© Art Wolfe/Mint Images)(Bing United Kingdom)

Detail of spines on the exterior of a sea star (Evaserias retifera) near Primorsky Krai, Russia (© SuperStock)(Bing United Kingdom)

Hanalei Valley, Kauai, Hawaii, USA (© Ian Philip Miller/Getty Images)(Bing United Kingdom)