The Roman Forum, Rome, Italy (© Peter Zelei Images/Getty Images)

Wales Millennium Centre and The Pierhead building at dawn, Cardiff Bay (© Carl DeAbreu Photography/Shutterstock)

Moonlight and the Milky Way over Mount Rainier National Park, Washington, USA (© Brad Goldpaint/Cavan)

Gruffalo sculpture, Whinlatter Forest National Park, Lake District (© Philip Moran/Alamy Stock Photo)

The National Aquatics Centre in Beijing, China (© Han Haidan/China News Service via Getty Images)

The island of Mont-Saint-Michel in Normandy, France (© DaLiu/Getty Images)

Great cormorants gliding through a snowstorm in Hesse, Germany (© Wilfried Martin/Getty Images)

Lake Tekapo and Aoraki/Mount Cook National Park on New Zealand's South Island (© Sophie Dover/Getty Images)

Women of Steel bronze sculpture in Sheffield city centre, by sculptor Martin Jennings. (© Rory Prior/Alamy Stock Photo)

The Flower of Life symbol drawn in the snow by artist Michael Uy, Jacobsdorf, Brandenburg, Germany (© Patrick Pleul/picture alliance via Getty Images)

Ponte Vecchio bridge near Bobbio, Italy (© afinocchiaro/Getty Images)

Field of sunflowers, Ukraine's national flower (© Oleksandrum/Shutterstock)

Sunset over Wheaton River near Whitehorse, Yukon, Canada (© Robert Postma/Design Pics/Shutterstock)

Cable car station at the summit of Zugspitze mountain in Grainau, Garmisch-Partenkirchen, Germany (© Robert Jank/Alamy)

Lanyon Quoit burial chamber, Cornwall (© Guy Edwardes/Minden Pictures)

Giant panda in Wolong National Nature Reserve, Sichuan, China (© Katherine Feng/Minden Pictures)

Coastal redwoods and wood sorrel, Prairie Creek Redwoods State Park, California, USA (© Jack Dykinga/Minden Pictures)

Colourful powders for sale during the festival of Holi (© Nuno Valadas/Getty Images)

Chicagohenge sunset, Chicago, USA (© Razvan Sera/Amazing Aerial Agency)

Javan tree frog, Indonesia (© kuritafsheen/Getty Images)

Holy Trinity Church, Stratford-upon-Avon (© James Osmond/Getty Images)

Waterfall in Thousand Springs State Park, Hagerman Valley, Idaho, USA (© knowlesgallery/Getty Images)

Grand Canyon National Park during a thunderstorm, Arizona, USA (© spkeelin/Getty Images)

Red squirrels in a nest of lichen and pine needles, Scottish Highlands (© Neil Anderson/Minden Pictures)

Lauterbrunnen Valley in the Swiss Alps (© Leonid Andronov/Getty Images)

A European hare jumps through a wetland in the Netherlands (© Jim Brandenburg/Minden Pictures)

Swan and her cygnets on a nest in Stroud, Gloucestershire (© PJ photography/Shutterstock)

Kawachi Fuji Garden, Kitakyushu, Japan (© Steve Tan C K Photography/Getty Images)

Belted Galloway cows in Galloway (© JohnFScott/Getty Images)

Eiffel Tower in Paris, France (© Susanne Kremer/eStock Photo)

Greetings From Giza by Jean Rene, in Cairo, Egypt (© Ammar ABD RABBO/Abaca Press/Alamy)