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Fort Jefferson, Dry Tortugas National Park

Key West, FL 33041, USA

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.


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Fort Jefferson is located on Garden Key, Dry Tortugas, 70 miles west of Key West. Passenger ferries and seaplane depart daily from Key West, weather permitting.

Visitor Services

Gift shop, visitor center; camping, snorkeling, fishing, swimming, bird watching, Guided tours of Fort Jefferson are offered daily.

Plan Your Visit

Admission Fee

Adults $5.00.


Daily: Sunrise to sunset.



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