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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