Key West

Stretching gracefully across the expanse where the Gulf of Mexico meets the Atlantic Ocean, the Seven Mile Bridge stands as one of the world's most breathtaking highway spans and an undeniable masterpiece of coastal engineering. Serving as a crucial segment of U.S. Route 1—the Overseas Highway—this world-renowned bridge connects Knight's Key in Middle Keys (near Marathon) to Little Duck Key in the Lower Keys, creating an unforgettable gateway toward Key West. History & Architectural Heritage The story of the Seven Mile Bridge is a fascinating tale of human ambition and resilience. Its roots trace back to the early 20th century with Henry Flagler’s visionary Florida East Coast Railway. Completed in 1912, the original structure was dubbed the "Eighth Wonder of the World," breaking unprecedented engineering boundaries to link the isolated Florida Keys to mainland Florida by rail. After the devastating Labor Day Hurricane of 1935 damaged the rail lines, the structure was converted into an automobile highway. As vehicle traffic grew over the decades, construction began on a modern, reinforced concrete highway bridge parallel to the historic span. Completed in 1982, the new Seven Mile Bridge spans 35,862 feet (roughly 6.8 miles) and features a continuous box-girder design built to withstand extreme hurricane-force winds and harsh marine corrosion. The Driving Experience Driving across the Seven Mile Bridge offers an incomparable visual journey. Suspended elevated above crystal-clear, multi-hued turquoise waters, drivers feel as though they are gliding across the surface of the ocean itself. Looking out from the vehicle windows, travelers can spot marine life—such as sea turtles, stingrays, and pods of dolphins—swimming in the shallow flats below. Directly adjacent to the modern driving bridge runs the historic Old Seven Mile Bridge. A portion of this historic span leading to Pigeon Key—a tiny, historic island nestled under the bridge's shadows—has been meticulously restored for pedestrians, bicyclists, and sightseers.