The Eight New Natural Wonders

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Every year, millions of monarch butterflies wait for the end of the winter season in close-packed clusters in the Oyamel fir forests.

Danny Lehman / Corbis

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Monarch Butterfly Biosphere, Mexico
Every year, millions of monarch butterflies wait for the end of the winter season in close-packed clusters in the Oyamel fir forests.

2007 World Heritage Sites

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