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Fort Jefferson, Dry Tortugas National Park

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Florida

Key West, FL 33041, USA

Website: www.nps.gov/drto »

Once known as the "Gibraltar of the Gulf, " Fort Jefferson is the largest all-masonry fort in the Western Hemisphere. It was garrisoned by Union troops throughout the Civil War and also served as a military prison. Dr. Samuel Mudd and three Lincoln assassination conspirators were among those imprisoned at the fort.