A giant portrait of Nelson Mandela on a wall in Camden, London. (© NurPhoto/Contributor/Getty Images)(Bing United Kingdom)

Balloons at the Albuquerque International Balloon Fiesta in New Mexico, USA (© gmeland/Shutterstock)(Bing United Kingdom)

Port House designed by Zaha Hadid Architects, Antwerp, Belgium (© Dmitry Rukhlenko/Alamy)(Bing United Kingdom)

Cosmic Cliffs in the Carina Nebula (© NASA, ESA, CSA, and STScI)(Bing United Kingdom)

Caribbean flamingos, Ría Lagartos Biosphere Reserve, Yucatán Peninsula, Mexico (© Claudio Contreras/Minden Pictures)(Bing United Kingdom)

Bay of Biscay in the Basque Coast Geopark near Bilbao, Spain (© Olimpio Fantuz/eStock Photo)(Bing United Kingdom)

Designs projected on the Oberbaum Bridge during the yearly Festival of Lights in Berlin, Germany (© John MacDougall/AFP via Getty Images)(Bing United Kingdom)

Glass octopus in the Atlantic Ocean off Cabo Verde (© Solvin Zankl/Minden Pictures)(Bing United Kingdom)

Blooms of phytoplankton in the Chukchi Sea off the coast of Alaska, USA (© Norman Kuring/Kathryn Hansen/U.S. Geological Survey/Nasa)(Bing United Kingdom)

Aerial view of a boat in Kerala, India (© Ebin Francis/Shutterstock)(Bing United Kingdom)

Wall-screw moss glistening with water droplets, Netherlands (© Arjan Troost/Minden Pictures)(Bing United Kingdom)

Ammonite Pavement at Monmouth Beach, Dorset (© AWL Images/Danita Delimont)(Bing United Kingdom)

View over Windermere, Lake District, Cumbria (© Chris Warren/eStock Photo)(Bing United Kingdom)

Waterfall on the Rio Arazas in Ordesa y Monte Perdido National Park, Pyrenees, Spain (© David Santiago Garcia/Cavan Images)(Bing United Kingdom)

Naqsh-e Rustam archaeological site near Persepolis, Iran (© mshirani/Shutterstock)(Bing United Kingdom)

Prince Christian Sound in southern Greenland (© Posnov/Getty Images)(Bing United Kingdom)

Long-eared owl in the Bohemian-Moravian Highlands of the Czech Republic (© Ondrej Prosicky/Alamy)(Bing United Kingdom)

Ceiling above gate of Bush House, former HQ of BBC World Service (© LillaSam/Shutterstock)(Bing United Kingdom)

Thuringian Forest in autumn with Wartburg Castle, Germany (© ezypix/Getty Images)(Bing United Kingdom)

Hoffmann's two-toed sloth mother and young, Puerto Viejo de Talamanca, Costa Rica (© Suzi Eszterhas/Minden Pictures)(Bing United Kingdom)

Cypress trees in autumn, Georgia, USA (© Chris Moore/Tandem Stills + Motion)(Bing United Kingdom)

Karst mountains in Guilin and Lijiang River National Park, China (© Sean Pavone/Alamy)(Bing United Kingdom)

Mute swan in Valkenhorst Nature Reserve, near Valkenswaard, the Netherlands (© David Pattyn/Minden Pictures)(Bing United Kingdom)

Oil lamps arranged on a rangoli to celebrate Diwali in Guwahati, India (© Biju Boro/Getty Images)(Bing United Kingdom)

Orcus sculpture in the Gardens of Bomarzo in Bomarzo, Italy (© Scott Wilson/Alamy)(Bing United Kingdom)

Brocken spectre in Central Balkan National Park, Bulgaria (© Maya Karkalicheva/Getty Images)(Bing United Kingdom)

Bridge of Sighs in Venice, Italy (© Doug Pearson/Alamy)(Bing United Kingdom)

Stormy sky over Lake Geneva in Lausanne, Switzerland (© Suradech Singhanat/Shutterstock)(Bing United Kingdom)

Sea angel (© Alexander Semenov Images/Shutterstock)(Bing United Kingdom)

The sun sets over the Eastgate Clock in Chester. (© ZinCat/Getty Images)(Bing United Kingdom)

Trees in Wychwood Forest near Chipping Norton, Oxfordshire (© Frederick Ardley/Getty Images)(Bing United Kingdom)