Fort Jefferson, a formidable coastal fortress, is located in the Dry Tortugas National Park, approximately 70 miles west of Key West, Florida. Construction of this immense masonry structure began in 1846 and continued for several decades. The fort was intended to serve as a strategic military outpost to protect the Gulf of Mexico and the shipping lanes in the area. Its unique location on Garden Key, surrounded by turquoise waters and coral reefs, adds to its allure as a historical gem within the stunning backdrop of the Dry Tortugas.
The design of Fort Jefferson is notable for its hexagonal shape and sheer size, making it one of the largest coastal forts in the United States. The fort’s construction utilized over 16 million bricks, earning it the nickname “America’s Gibraltar.” Despite its grandeur, Fort Jefferson never saw active combat. Instead, it served as a military prison during the Civil War and later gained notoriety as the site where Dr. Samuel Mudd, convicted in connection with the assassination of President Abraham Lincoln, was imprisoned.
Today, Fort Jefferson is a captivating destination for history enthusiasts and nature lovers alike. Accessible only by boat or seaplane, visitors can explore the well-preserved ruins, marvel at the architecture, and appreciate the abundant marine life in the surrounding waters. The fort stands as a testament to the intricate interplay between history and nature, offering a glimpse into the strategic military considerations of the past amidst the breathtaking beauty of the present-day tropical paradise.

It’s a good idea to look at these 10 fun facts about Fort Jefferson to know more about it.
- Remote Location: Fort Jefferson is situated on Garden Key, one of the remote Dry Tortugas islands. Its isolation in the Gulf of Mexico contributes to its unique historical and ecological significance.
- Impressive Construction: The fort is constructed from over 16 million bricks, making it one of the largest masonry structures in the Western Hemisphere. The sheer scale and hexagonal design of Fort Jefferson are architectural marvels.
- Never Fired a Shot in Anger: Despite its imposing appearance, Fort Jefferson never saw combat. Its strategic location, however, played a crucial role in monitoring and protecting shipping lanes in the Gulf of Mexico.
- Prison for Dr. Mudd: The fort gained historical notoriety as the place where Dr. Samuel Mudd was imprisoned for his role in treating John Wilkes Booth, the assassin of President Abraham Lincoln, during the Civil War.
- Dry Tortugas National Park: Fort Jefferson is part of the Dry Tortugas National Park, which encompasses a cluster of seven islands known for their crystal-clear waters, coral reefs, and diverse marine life.
- Moat and Drawbridge: The fort features a moat and drawbridge, adding to its military defensive design. The drawbridge allowed for controlled access to the fort, enhancing its security measures.
- Tropical Ecosystem: The Dry Tortugas are home to a diverse array of marine life, including vibrant coral reefs and a variety of fish species. Snorkeling and diving enthusiasts are drawn to the area’s rich underwater landscapes.
- Birdwatcher’s Paradise: The islands surrounding Fort Jefferson serve as a haven for birdwatchers, with various seabird species and migratory birds frequenting the area. It’s a crucial stop for many birds during their migrations.
- Famous Shipwrecks: The waters around Fort Jefferson are known for several historic shipwrecks, adding an element of maritime archaeology to the region’s allure.
- Limited Accessibility: Accessible only by boat or seaplane, reaching Fort Jefferson is an adventure in itself. This remoteness contributes to the preservation of its historical integrity and the protection of its delicate natural surroundings.
In the heart of the azure waters of the Gulf of Mexico, Fort Jefferson stands as both a sentinel of history and a testament to the harmonious coexistence of architecture and nature. Its colossal hexagonal structure, crafted from millions of bricks, dominates the remote island of Garden Key in the Dry Tortugas. Despite its grandeur, this coastal fortress never witnessed the thunder of cannons in battle but instead served as a strategic guardian of maritime routes. From the incarceration of Dr. Samuel Mudd to its role in monitoring the waters teeming with marine life, Fort Jefferson weaves a captivating tale of the past. Today, accessible only by boat or seaplane, it welcomes adventurers and history enthusiasts alike to explore its well-preserved ruins amidst the enchanting backdrop of coral reefs and tropical serenity, embodying the enduring spirit of a bygone era.