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11 Most Endangered Places

12 of 12

Bridges of Yosemite Valley

Yosemite Valley's historic bridges spanning the Merced River are being considered for removal, putting them on the 2012 endangered list. Above: Hikers pause at Vernal Falls Bridge over the Merced River in Yosemite National Park.

(AP Photo)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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