#OnlyintheKeys is one of the longest segmental bridges in the world, and the centerpiece of the Florida Keys Overseas Highway. Despite its name, the Seven Mile Bridge isn’t seven miles long. It’s only 6.79 miles. The original span, today called the Old Seven Mile Bridge, was built more than a century ago as part of Henry Flagler’s Florida Keys Over-Sea Railroad, a unique railway completed in 1912. Its tracks stretched more than 100 miles out over open water, connecting the Keys with each other a