Red-billed oxpeckers on an impala, Kruger National Park, South Africa (© Friedrich von Hörsten/Alamy)(Bing United Kingdom)

Hanoi, Vietnam (© David Santiago Garcia/Aurora Photo)(Bing United Kingdom)

Visitors in Death Valley National Park, California, USA (© David Hellard/Rex Features)(Bing United Kingdom)

Rocky Mountain National Park, Colorado, USA (© Dan Ballard/Corbis)(Bing United Kingdom)

Leopard perched in a tree in the Moremi Game Reserve, Botswana (© Getty Images)(Bing United Kingdom)

Meltwater creates waterfalls on an ice cap, Svalbard Archipelago, Norway (© Ralph Lee Hopkins/Corbis)(Bing United Kingdom)

Valais blacknose sheep in Valais, Switzerland (© NaturePL/SuperStock)(Bing United Kingdom)

Millau Viaduct over the Tarn River Valley near Millau, France (© Patrick Landmann/Science Photo Library)(Bing United Kingdom)

Rio Tinto, Huelva, Spain (© David Santiago Garcia/Aurora Photos)(Bing United Kingdom)

Canoe on Moraine Lake in Banff National Park, Alberta, Canada (© Getty Images)(Bing United Kingdom)

Chipmunk eating red berries (© Takao Onozato/Aflo/Getty Images)(Bing United Kingdom)

Mesa Arch, Canyonlands National Park, Utah, USA (© Jeff Clay/Tandem Still + Motion)(Bing United Kingdom)

Palais Royal in Paris, Ministry of Culture, France (© Production Perig/Shutterstock)(Bing United Kingdom)

Aerial View of Triangle Island Ecological Reserve, British Columbia, Canada (© Russ Heinl/Corbis)(Bing United Kingdom)

Mayan pyramids, Tikal, Guatemala (© AirPano)(Bing United Kingdom)

Young guanaco seeking safety under mother, Torres del Paine National Park, Chile (© Gavriel Jecan/Aurora Photos)(Bing United Kingdom)

A dredge boat near the Glénan Islands, France (© Andia/Latitude Stock)(Bing United Kingdom)

A pier goes through the ocean in Iracema beach, Fortaleza city, Ceará state, Brazil (© SIME/eStock Photo)(Bing United Kingdom)

Macaws, Tambopata National Reserve, Peru (© Frans Lanting/Getty Images)(Bing United Kingdom)

Ferris wheel gondolas, Oktoberfest, Munich, Germany (© Karlheinz Irlmeier/Corbis)(Bing United Kingdom)

Peace Camp at Downhill Beach in Northern Ireland (© Christopher Hill Photographic/Alamy)(Bing United Kingdom)

Orcas in Resurrection Bay near Kenai Fjords National Park, Alaska, USA (© Steven Kazlowski/SuperStock)(Bing United Kingdom)

Abandoned army trucks on the North Canol Road, Yukon, Canada (© Robert Postma/Corbis)(Bing United Kingdom)

Banana slug in Prairie Creek Redwoods State Park, California, USA (© Michael Nichols/Getty Images)(Bing United Kingdom)

Three Gorges, Yangtze river, China (© View Stock/Getty Images)(Bing United Kingdom)

Elephants in the Okavango Delta, Botswana (© Michael Poliza/Getty Images)(Bing United Kingdom)

Tulips at the Floriade flower festival in Canberra, Australia (© Ginevre Marlow/Alamy)(Bing United Kingdom)

Boathouses on Lake Panache, Greater Sudbury, Ontario, Canada (© Don Johnston/Corbis)(Bing United Kingdom)

Hohenzollern Castle near Stuttgart, Germany (© Heinz Wohner/Getty Images)(Bing United Kingdom)

Sheep with a border collie in England (© Wayne Hutchinson/Minden Pictures)(Bing United Kingdom)