Fort Jefferson

Construction of Fort Jefferson began in 1846 to protect the vital Gulf shipping lanes, and though it was never finished or fully armed, it grew into an enormous six-sided fort with walls reaching some 45 feet high. Its scale, built brick by brick on a remote sandbar, is staggering, and a moat surrounds the walls, once a defense and now a scenic feature.

During and after the Civil War, the fort served as a prison, most famously holding Dr. Samuel Mudd, convicted for his role in the aftermath of the Lincoln assassination. Disease, hurricanes, and isolation eventually led the military to abandon it, and today the weathered fort stands as a haunting, beautiful monument to 19th-century ambition.

Because Dry Tortugas is so remote, Fort Jefferson can only be reached by boat or seaplane, typically on a ferry or seaplane service from Key West, or by private boat. The journey across open water is part of the adventure, and reaching the fort feels like arriving at the end of the earth.

On the island, visitors can tour the fort, walk the moat wall, relax on the small beaches, and snorkel in the clear water right off the walls, where coral and fish thrive. There are no services beyond restrooms, so everyone must bring their own water, food, and sun protection. Camping is available for those who want to stay overnight under the stars, far from any lights.

The closest Boutel™ stays, so you can turn this stop into an overnight. Each is a place we chose through independent editorial review, never a paid placement.

Fort Jefferson is a massive 19th-century brick coastal fort on Garden Key in Dry Tortugas National Park, Florida, about 70 miles west of Key West. One of the largest brick structures in the Americas, built with over 16 million bricks, it was begun in 1846 to guard the Gulf shipping lanes and later served as a military prison. Its enormous six-sided walls, surrounded by a moat, rise straight from the turquoise sea on a tiny remote island. Never fully completed or armed, the fort was eventually abandoned, and today it stands as a haunting, beautiful monument to 19th-century ambition. Reached only by boat or seaplane, Fort Jefferson blends dramatic history with tropical isolation, and visitors can tour the fort and snorkel the clear waters right off its walls.

Fort Jefferson, in Dry Tortugas National Park, can only be reached by boat or seaplane, since it lies about 70 miles west of Key West across open water, with no bridges or roads. Most visitors take an authorized ferry, which makes a several-hour round trip from Key West, or a seaplane, which is faster and offers aerial views but carries fewer passengers; private boats can also make the crossing. Because access is limited and popular, especially the ferry, it is important to book well in advance and to check current schedules and services. The journey across the open Gulf is part of the adventure. Once there, come fully prepared, as there are no stores; bring water, food, sun protection, and everything you need for the day, and be ready for a remote, tropical island experience.

Fort Jefferson served as a military prison during and after the Civil War, holding Union deserters and other prisoners, but its most famous inmate was Dr. Samuel Mudd. Mudd was a physician who was convicted for his role in the aftermath of President Abraham Lincoln's assassination, having set the broken leg of John Wilkes Booth, the assassin, as Booth fled. Mudd was sentenced to imprisonment at the remote fort. During a yellow fever outbreak at Fort Jefferson, he helped treat the sick after the prison doctor died, and his efforts contributed to his eventual pardon and release. The story of Dr. Mudd, along with the fort's grim isolation, disease, and hurricanes, is a central part of Fort Jefferson's history, which rangers and exhibits share with visitors today.

Yes, camping is available on Garden Key at Fort Jefferson, and it is a memorable way to experience the remote park after the day visitors leave. The campground is small and primitive, with basic sites and composting toilets but no fresh water, no store, and no other services, so campers must bring absolutely everything they need, including all their water, food, and supplies, and pack out all trash. Reaching the campground requires arranging transportation of yourself and your gear on the ferry or by private boat, and spots are limited, so planning and reservations well in advance are important. The reward is having the fort and island nearly to yourself in the evening and at night, with brilliant dark skies far from any city lights, and swimming and snorkeling in the clear water. Always check current camping rules, fees, and transport options with the park before planning a trip.