View over Athens and the Acropolis, Greece (© Mlenny/Getty Images)

Haut-Barr Castle, Alsace, France (© Andrea Pistolesi/Getty Images)

Salt flats in Badwater Basin, Death Valley National Park, California, USA (© Jim Patterson/Tandem Stills + Motion)

Pacific sea nettles off the coast of Carmel, California, USA (© Jim Patterson/Tandem Stills + Motion)

Quartzite formation, Playa del Silencio, Asturias, Spain (© Jean-Philippe Delobelle/Minden Pictures)

Firework display at Boughton House, Kettering (© Ben Browning/Alamy Stock Photo)

Lake Pehoé, Torres del Paine National Park, Chile (© OST/Getty Images)

Kirkilai lakes and lookout tower, Biržai Regional Park, Lithuania (© MNStudio/Shutterstock)

Llyn Padarn, Llanberis, Snowdonia, Wales (© Joe Daniel Price/Moment/Getty Images)

Birch trees in autumn, Drammen, Norway (© Baac3nes/Getty Images)

Badlands National Park, South Dakota, USA (© Grant Ordelheide/Tandem Stills + Motion)

Val di Funes, South Tyrol, Italy (© Achim Thomae/Getty Images)

Lamps on the banks of the Sarayu River on Diwali, Ayodhya, India (© SANJAY KANOJIA/AFP/Getty Images)

Old olive grove in the Serra Tramuntana range, Majorca, Spain (© cinoby/Getty Images)

Russell lupines along Lake Tekapo, South Island, New Zealand (© Jeffrey Lewis/Tandem Stills + Motion)

Rapa Valley in Sarek National Park, Sweden (© Hans Strand/Getty Images)

Meon Hill, Gloucestershire, England (© Stuart Black/Alamy Stock Photo)

Polar bear mother and cubs, Churchill, Manitoba, Canada (© Thorsten Milse/Getty Images)

Alam-Pedja Nature Reserve, Estonia (© Sven Zacek/Minden Pictures)

Chapman Adventure Playground in the Gathering Place, Tulsa, Oklahoma, USA (© Susan Vineyard/Alamy)

Grey seal pup on the beach of Norfolk, England (© Vince Burton/Minden Pictures)

Grand Teton National Park, Wyoming, USA (© Westend61/Getty Images)

Teide National Park, Tenerife, Canary Islands, Spain (© Javier Martínez Morán/Alamy)

Hall of Mosses trail in the Hoh Rain Forest, Olympic National Park, Washington, USA (© James Randklev/Getty Images)

Toledo, Spain (© Carlos Fernandez/Getty Images)

Fallow deer in Bradgate Park, Leicestershire, England (© Chris Bainbridge/Alamy)

Rio Negro, Brazil (© Timothy Allen/Getty Images)

Giant land art fresco by artist Saype, Istanbul, Turkey (© Chris McGrath/Getty Images)

Rockefeller Centre Christmas Tree, New York City, USA (© Jonathan Orenstein/Getty Images)

Leadenhall Market, London (© Vittorio Caramazza/Alamy Stock Photo)