December 16, 2012
Great Barrier Reef, Australia
Photograph by Yann Arthus-Bertrand, Corbis
The largest structure on Earth built by living organisms, the Great Barrier Reef covers an area nearly the size of Montana. It sprawls off the east coast of Queensland, Australia, and attracts more than two million visitors a year.
World Heritage Site: Great Barrier Reef >>
Australia Photos >>
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