Piscataqua River, Portsmouth, New Hampshire, USA (© Denis Tangney Jr./Getty Images)(Bing Australia)

Colourful sunrise over Corfe Castle, United Kingdom (© Matt Gibson/Corbis)(Bing Australia)

Everglades National Park, Florida, USA (© Angelo Cavalli/Aurora Photos)(Bing Australia)

A glimpse of the Harbin International Ice and Snow Sculpture Festival in Harbin, China (© Yang Wang)(Bing Australia)

People surfing at dusk, Geriba Beach, Buzios, Brazil (© Mark Leibowitz/Masterfile)(Bing Australia)

Evening view of the city skyline of Vancouver, Canada, from Stanley Park (© Paul Giamou/Aurora Photos)(Bing Australia)

Bryce Canyon National Park in winter, Utah, USA (© AirPano)(Bing Australia)

Aerial view of trees in the outback of Queensland, Australia (© Richard Woldendorp/Getty Images)(Bing Australia)

European otter near Lelystad, Netherlands (© Ernst Dirksen/Minden Pictures)(Bing Australia)

Tributes of candles, pens and flowers at Place de la Republique, Paris, France (© Kristy Sparow/Getty Images)(Bing Australia)

Verona, Italy along the Adige River (© Franco Cogoli/4Corners Images)(Bing Australia)

Root structure in a mudflat near Norman River in Queensland, Australia (© Robin Smith/Getty Images)(Bing Australia)

Aurora borealis over Tombstone Territorial Park, Yukon, Canada (© Nagesh Mahadev)(Bing Australia)

Japanese tree frogs (© Shinji Kusano/Minden Pictures)(Bing Australia)

Big Golden Guitar in Tamworth, New South Wales (© Stonemeadow Photography/Alamy)(Bing Australia)

Blue wildebeest herd at the Mara River in Masai Mara National Reserve, Kenya (© Winfried Wisniewski/Corbis)(Bing Australia)

Under a bridge spanning the Odiel River, Huelva, Spain (© Antonio Arcos aka Fotonstudio Photography/Getty Images)(Bing Australia)

Tsingy de Bemaraha National Park, Madagascar (© Frans Lanting/Mint)(Bing Australia)

Emperor penguin chicks in Antarctica (© Jan Vermeer/Minden Pictures)(Bing Australia)

Château de Chillon on Lake Geneva, Switzerland (© Philippe Saire Photography/Getty Images)(Bing Australia)

Philipsburg, Sint Maarten (© Sean Pavone/Shutterstock)(Bing Australia)

African buffalo at a watering hole in Queen Elizabeth National Park, Uganda (© Joel Sartoire/Getty Images)(Bing Australia)

Westfriedhof subway station in Munich, Germany (© Manfred J. Bail/Alamy)(Bing Australia)

Spiral staircase by Leonardo da Vinci in the Château de Chambord, Loir-et-Cher, France (© Sylvain Sonnet/Corbos)(Bing Australia)

Red Kangaroos (macropus rufus) hopping in the Australian outback (© Gerard Lacz/Age Fotostock)(Bing Australia)

A kayaker crosses Grey Lake in Torres del Paine National Park, Chile (© Marco Simoni/Aurora Photos)(Bing Australia)

Cranes moving cargo in a Bangkok, Thailand shipping port (© Getty Images)(Bing Australia)

Eurasian red squirrels in Finland (© Jorma Luhta/Minden Pictures)(Bing Australia)

Rhône Glacier ice grotto in Valais, Switzerland (© CEM/Getty)(Bing Australia)

Mount Baker-Snoqualmie National Forest, Washington, USA (© Ethan Welty/Aurora Photos)(Bing Australia)

Opal mine tunnels at Coober Pedy in South Australia (© John Frumm/hemis.fr/Alamy)(Bing Australia)