Group of juvenile barn swallows, Wales, UK (@ David Slater/Aurora Photos)

Group of juvenile barn swallows, Wales, UK (@ David Slater/Aurora Photos)

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Summer poppies at sunset (@ Anthony Spencer/Getty Images)

Summer poppies at sunset (@ Anthony Spencer/Getty Images)

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Wild piglets in Schleswig-Holstein, Germany (@ Gerhard Schulz/age fotostock)

Wild piglets in Schleswig-Holstein, Germany (@ Gerhard Schulz/age fotostock)

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The ceiling of Southwark Cathedral in London, England (@ Loop Images/Superstock)

The ceiling of Southwark Cathedral in London, England (@ Loop Images/Superstock)

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Nevada Solar One at sunrise in the Mojave Desert near Boulder City, California, U.S.A. (@ David Nunuk/Corbis)

Nevada Solar One at sunrise in the Mojave Desert near Boulder City, California, U.S.A. (@ David Nunuk/Corbis)

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The Space Needle and its reflection on the surface of the EMP Museum in Seattle, Washington, U.S.A. (@ Lonnye Bower)

The Space Needle and its reflection on the surface of the EMP Museum in Seattle, Washington, U.S.A. (@ Lonnye Bower)

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Green sea turtle hatchlings at Boatswain's Bay, Grand Cayman Island (@ Stephen Frink/Corbis)

Green sea turtle hatchlings at Boatswain's Bay, Grand Cayman Island (@ Stephen Frink/Corbis)

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