Luminaria festival at Cliff Palace in Mesa Verde National Park, Colorado (© Richard Ellis/Alamy)(Bing United States)

[20161210] - 'Luminaria festival at Cliff Palace in Mesa Verde National Park, Colorado (© Richard Ellis/Alamy)(Bing United States)'

Climbers ascending the Jungfrau, in the Bernese Alps, Switzerland (© plainpicture/Cultura/Lost Horizon Images)(Bing United States)

[20161209] - 'Climbers ascending the Jungfrau, in the Bernese Alps, Switzerland (© plainpicture/Cultura/Lost Horizon Images)(Bing United States)'

A pedestrian skyway in Hong Kong’s Wan Chai District, China (© timestock22/Nimia)(Bing United States)

[20161208] - 'A pedestrian skyway in Hong Kong’s Wan Chai District, China (© timestock22/Nimia)(Bing United States)'

Navy personnel at the first Pearl Harbor Remembrance in 1942, Kaneohe Bay, Hawaii (© Bettmann/Getty Images)(Bing United States)

[20161207] - 'Navy personnel at the first Pearl Harbor Remembrance in 1942, Kaneohe Bay, Hawaii (© Bettmann/Getty Images)(Bing United States)'

A frozen waterfall in the Korouoma Gorge, Finland (© Niall Benvie/Minden Pictures)(Bing United States)

[20161206] - 'A frozen waterfall in the Korouoma Gorge, Finland (© Niall Benvie/Minden Pictures)(Bing United States)'

Semiconductor manufacturing at Infineon Technologies in Villach, Austria (© Krisztian Bocsi/Bloomberg/Getty Images)(Bing United States)

[20161205] - 'Semiconductor manufacturing at Infineon Technologies in Villach, Austria (© Krisztian Bocsi/Bloomberg/Getty Images)(Bing United States)'

Quinoa plants in Peru (© Westend61 GmbH/Alamy)(Bing United States)

[20161204] - 'Quinoa plants in Peru (© Westend61 GmbH/Alamy)(Bing United States)'

Red grouse in the Scottish Highlands (© Mark Sisson/REX/Shutterstock)(Bing United States)

[20161203] - 'Red grouse in the Scottish Highlands (© Mark Sisson/REX/Shutterstock)(Bing United States)'

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