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Flat crepe mushrooms (Crepidotus applanatus) -- Dick Poe/Visuals Unlimited, Inc.
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Donkey looking over an ancient rock wall in Ireland -- Ryan Donnell/Corbis
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Sunset of Elliott Bay taken from the Space Needle, Seattle, Washington -- Mohammed Kamel
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Incan ruins of Machu Picchu outside Cuzco, Peru -- Sean Caffrey/Lonely Planet Publications Ltd.
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