See

Fort Jefferson

Dry Tortugas National Park, United States

Photo: U.S. National Park Service, Public domain via Wikimedia Commons

About

Fort Jefferson, the largest all-masonry fort in the United States, was built between 1846 and 1875 to protect the nation's gateway to the Gulf of Mexico. During the Civil War, it was used as a Federal prison primarily for Union deserters, though in 1865 three of the Lincoln conspirators were imprisoned within its walls.

Fort Jefferson is a former U.S. military coastal fortress in the Dry Tortugas National Park of Florida. It is the largest brick masonry structure in the Americas, covering 16 acres (6.5 ha) and constructed of over 16 million bricks. Among United States forts, only Fort Monroe in Virginia and Fort Adams in Rhode Island are larger. The fort is located on Garden Key in the lower Florida Keys within the Dry Tortugas, 68 miles (109 km) west of the island of Key West. The Dry Tortugas are part of Monroe County in Florida.
From Wikipedia · Fort Jefferson

Map of Fort Jefferson

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Guide text adapted from the Wikivoyage article "Dry Tortugas National Park" by its contributors, available under CC BY-SA 4.0. Read on Wikivoyage · Contributors · CC BY-SA 4.0
Summary from the Wikipedia article "Fort Jefferson", available under CC BY-SA 4.0. Wikipedia
Photo: U.S. National Park Service, Public domain via Wikimedia Commons

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