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Fort Knox State Historic Site

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Maine

740 Fort Knox Road
Prospect, Maine 04981
Website: http://fortknox.maineguide.com/

Fort Knox, built to protect the Penobscot River Valley from attack, is a massive third-system defensive structure overlooking the Penobscot River that was used as a garrison for Union troops during the Civil War. The Penobscot Narrows Bridge and Observatory features a 420-foot tall observation tour overlooking the river, the only one of its kind in the western hemisphere.