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The most endangered historic places in the U.S.

a canon at fort gaines pointing out at the water

Photo: faungg/Flickr

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Fort Gaines

This massive brick military fort on the Gulf of Mexico in southern Alabama was completed in 1861, just in time to play a pivotal role in the American Civil War. The facility looks almost exactly as it did in the 1860s, with original canons used in combat, kitchens, a tunnel system and a restored blacksmith shop — though it now suffers from relentless erosion by Gulf waves, at a rate of about nine feet per year.