Sailboats racing in the 2008 Acura Miami Grand Prix, Florida, U.S.A. (@ Sharon Green/Corbis)

Sailboats racing in the 2008 Acura Miami Grand Prix, Florida, U.S.A. (@ Sharon Green/Corbis)

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Combine harvester gathers the wheat crop, England (@ Corbis Motion)

Combine harvester gathers the wheat crop, England (@ Corbis Motion)

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Iron staircase of Currituck Beach Lighthouse, North Carolina, U.S.A. (@ Peter Ptschelinzew/Lonely Planet)

Iron staircase of Currituck Beach Lighthouse, North Carolina, U.S.A. (@ Peter Ptschelinzew/Lonely Planet)

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Majlis al Jinn, one of the world's largest cave chambers, Oman (@ Mark Daffey/Lonely Planet)

Majlis al Jinn, one of the world's largest cave chambers, Oman (@ Mark Daffey/Lonely Planet)

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Murray River National Park in Australia (@ Ignacio Palacios/Lonely Planet)

Murray River National Park in Australia (@ Ignacio Palacios/Lonely Planet)

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Rows of ice pops (@ Flirt/Superstock)

Rows of ice pops (@ Flirt/Superstock)

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Aerial view of Piriápolis waterfront and promenade, Uruguay (@ Bernardo Galmarini/Alamy)

Aerial view of Piriápolis waterfront and promenade, Uruguay (@ Bernardo Galmarini/Alamy)

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Plitvice Lakes National Park, Croatia (@ Clipcanvas)

Plitvice Lakes National Park, Croatia (@ Clipcanvas)

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Arrow crab on a sponge in the Caribbean Sea (@ Jurgen Freund/Aurora Photos)

Arrow crab on a sponge in the Caribbean Sea (@ Jurgen Freund/Aurora Photos)

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Sheep on Achill Island, County Mayo, Ireland (@ Maura Molloy)

Sheep on Achill Island, County Mayo, Ireland (@ Maura Molloy)

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Ice fields at the summit of Mount Kilimanjaro, Tanzania (@ Oleg Bulanyy)

Ice fields at the summit of Mount Kilimanjaro, Tanzania (@ Oleg Bulanyy)

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Wat Chai Wattanaram in Ayutthaya, Thailand (@ SIME/eStock Photo)

Wat Chai Wattanaram in Ayutthaya, Thailand (@ SIME/eStock Photo)

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Seaplanes docked in Seattle, Washington, U.S.A. (@ John & Lisa Merrill/Danita Delimont)

Seaplanes docked in Seattle, Washington, U.S.A. (@ John & Lisa Merrill/Danita Delimont)

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Aerial view of cultivated fields in Arizona, U.S.A. (@ Jim Wark/Lonely Planet)

Aerial view of cultivated fields in Arizona, U.S.A. (@ Jim Wark/Lonely Planet)

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Close-up of a melon (@ Corbis)

Close-up of a melon (@ Corbis)

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Fritillary butterfly sitting on a blade of grass (@ Clipcanvas)

Fritillary butterfly sitting on a blade of grass (@ Clipcanvas)

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Sheikh Zayed Bridge at night in Abu Dhabi, United Arab Emirates (@ spreephoto.de/Getty Images)

Sheikh Zayed Bridge at night in Abu Dhabi, United Arab Emirates (@ spreephoto.de/Getty Images)

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The Basin in Franconia Notch State Park, New Hampshire, U.S.A. (@ Danita Delimont/Getty Images)

The Basin in Franconia Notch State Park, New Hampshire, U.S.A. (@ Danita Delimont/Getty Images)

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Colourful seats in the Copper Box at the Olympic Park in Stratford, London, England (@ Edmund Sumner/Corbis)

Colourful seats in the Copper Box at the Olympic Park in Stratford, London, England (@ Edmund Sumner/Corbis)

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A detail of the Basketball Arena at the Olympic Park in Stratford, London, England (@ Bryn Lennon/Getty Images)

A detail of the Basketball Arena at the Olympic Park in Stratford, London, England (@ Bryn Lennon/Getty Images)

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Three dabbling ducks with their heads in the water, Saxony, Germany (@ S Meyers/Blickwinkel/age fotostock)

Three dabbling ducks with their heads in the water, Saxony, Germany (@ S Meyers/Blickwinkel/age fotostock)

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Aerial view of Hyde Park and the Serpentine Lake in London, England (@ Andrew Holt/Getty Images)

Aerial view of Hyde Park and the Serpentine Lake in London, England (@ Andrew Holt/Getty Images)

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The Olympic Stadium in Stratford, London, England (@ Michael Steele/Getty Images)

The Olympic Stadium in Stratford, London, England (@ Michael Steele/Getty Images)

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Dressage horse and rider (@ imagebroker.net/SuperStock)

Dressage horse and rider (@ imagebroker.net/SuperStock)

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Shooting complex at the Royal Artillery Barracks in London, England (@ Ben Stansall/AFP/Getty Images)

Shooting complex at the Royal Artillery Barracks in London, England (@ Ben Stansall/AFP/Getty Images)

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A golden snub-nosed monkey plays in a tree in the Qinling Mountains, Shaanxi province, China (@ Ma Xiaobo Photography China/Corbis)

A golden snub-nosed monkey plays in a tree in the Qinling Mountains, Shaanxi province, China (@ Ma Xiaobo Photography China/Corbis)

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Boats leaving their stations at the start of a race at Eton Dorney, in London, England (@ Rob Taylor/age fotostock)

Boats leaving their stations at the start of a race at Eton Dorney, in London, England (@ Rob Taylor/age fotostock)

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ExCeL Centre Phase 2 East Entrance in London, England (@ Edmund Sumner/age fotostock)

ExCeL Centre Phase 2 East Entrance in London, England (@ Edmund Sumner/age fotostock)

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Detail of the Velodrome at the London 2012 Olympic Park in Stratford, London, England (@ Anthony Collins Cycling/Alamy)

Detail of the Velodrome at the London 2012 Olympic Park in Stratford, London, England (@ Anthony Collins Cycling/Alamy)

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Swimming pool at the Aquatics Centre in the Olympic Park in Stratford, London, England (@ GEOFF CADDICK/epa/Corbis)

Swimming pool at the Aquatics Centre in the Olympic Park in Stratford, London, England (@ GEOFF CADDICK/epa/Corbis)

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