Seventy miles west of Key West, past the last stretch of the Florida Keys and out into the open Gulf of Mexico, there is a cluster of seven small coral islands that most people have never heard of. Dry Tortugas National Park is one of the least visited national parks in the country, and that is largely because getting there takes some effort. There are no roads, no bridges, and no runways. You can only reach it by water or air.
For those who make the trip, it is one of the most striking places in the United States. The water is a shade of blue that looks edited in photographs but is accurate in person. The beaches on Garden Key are white and largely empty. The coral reefs surrounding the islands are among the healthiest in Florida, protected by the park's remote location and strict conservation rules. And rising out of the center of it all is Fort Jefferson, a fortress built from 16 million bricks that looks like it belongs in a history textbook, not on a tiny island in the middle of the Gulf.
Fort Jefferson
Fort Jefferson is the park's centerpiece and the reason most people make the trip. Construction began in 1846, and the U.S. Army Corps of Engineers spent decades building what was intended to be the largest coastal defense fortification in the country. The fort is a hexagonal structure that covers most of Garden Key, with walls 8 feet thick and rising 45 feet above the water. It was designed to control shipping lanes in the Gulf of Mexico and protect the approach to the Mississippi River.
During the Civil War, the fort served as a Union military prison. Among the prisoners held here was Dr. Samuel Mudd, the physician who treated John Wilkes Booth's broken leg after the assassination of Abraham Lincoln. Mudd spent four years imprisoned at Fort Jefferson before receiving a pardon.
The fort was never fully completed and was eventually abandoned as a military installation. Today it is maintained by the National Park Service, and visitors can walk through the corridors, gun rooms, casemates, and parade grounds on a self-guided tour. The scale of the place is difficult to appreciate from photographs. Standing inside the walls, surrounded by open water in every direction, the isolation and ambition of the project really sets in.
Snorkeling
The snorkeling around Garden Key is considered some of the best on the eastern seaboard. Because the park is so remote and the waters are federally protected, the coral here is in better condition than in most other parts of the Florida Keys. The reef sits in clear, shallow water close to shore, making it accessible even for people who have never snorkeled before.
The marine life is abundant. Expect to see tropical fish in large numbers, sea fans, brain coral, elkhorn coral, nurse sharks, sea turtles, barracuda, and rays. The moat wall along Fort Jefferson's exterior is a popular snorkeling route, where fish congregate in the shadows of the brick structure. On a calm day, visibility can reach 60 feet or more.
Spearfishing and lobstering are prohibited within the park. This is a protected marine environment, and the rules are part of what keeps the ecosystem healthy.
Birding
The Dry Tortugas sit along a major migratory flyway, and the islands serve as a critical stopover for birds traveling between North and South America. Bush Key, which sits adjacent to Garden Key and is connected by a shallow sandbar during low tide, is one of the most important seabird nesting sites in the region.
During the spring and summer, thousands of sooty terns and brown noddies nest on Bush Key. Magnificent frigatebirds soar overhead year-round. Masked boobies, roseate terns, and dozens of other species pass through during migration season. In April and May, the birding is especially productive, as exhausted migratory songbirds land on Garden Key after crossing the Gulf and can be observed up close. Bring binoculars.
The Beaches
The beaches on Garden Key are small but beautiful. White sand, calm water, and almost no one else on them. There are no lounge chairs, umbrellas, or concession stands. It is as close to an untouched beach as you will find in the continental United States. The water is warm, clear, and shallow enough to wade comfortably close to shore.
The History Beyond the Fort
Spanish explorer Juan Ponce de León reached the islands in 1513 and named them "Las Tortugas" after the sea turtles that filled the surrounding waters. The "Dry" was added later to warn sailors that the islands had no fresh water. For centuries, the Tortugas served as a landmark for ships navigating the Gulf, and the surrounding shallow reefs claimed hundreds of vessels over the years.
Loggerhead Key, the westernmost island in the chain, is home to the Dry Tortugas Lighthouse, which has been guiding ships since the mid-1800s. The island sits about three miles west of Fort Jefferson and is reachable by private boat, offering a quieter and even more remote experience than Garden Key.
What to Bring
The Dry Tortugas are remote. There are no stores, restaurants, or facilities that sell food or drinks on the islands. You need to bring everything with you.
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Plenty of water and food for the full day
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Sunscreen and a hat (there is very little shade outside the fort)
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Towels
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Snorkel gear (or rent it through your charter company)
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A National Park entrance pass, which can be purchased online in advance
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Bug spray, especially in warmer months
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A camera or waterproof phone case
There is no cell phone service at the Dry Tortugas. Once you are roughly 30 miles offshore, you lose signal completely.
Getting There with SeaEO
SeaEO Luxury Boat Charters offers an 8-hour private charter to the Dry Tortugas departing from the Perry Hotel and Marina in Key West. The Axopar 37 XC Cross Cabin has the horsepower and hull design to handle the 70-mile open-water crossing comfortably, along with an enclosed climate-controlled cabin, a full bathroom, sunbeds, and seating for up to 13 guests plus the captain.
A private charter gives you something the other options to reach the park do not: control over your schedule. You decide how long to spend at the fort, how much time to dedicate to snorkeling, and whether to make stops along the way. Your captain can take you to Loggerhead Key to see the lighthouse, pause at the Marquesas Keys for additional snorkeling on the way out, or build in a fishing stop during the run back to Key West. The day is shaped around what your group wants to do.
Most boats in the SeaEO fleet are equipped with Starlink satellite internet, available as an add-on at checkout, which gives you WiFi coverage even 70 miles from shore. Snorkel gear is available to rent on board for $10.
You can check pricing, availability, and book your Dry Tortugas charter at sea-eo.com.