The Florida Keys are a string of coral islands that stretch southwest from the end of the state. They were historically oriented toward the Caribbean, and a center for boat trade and commerce. Key West was the largest town in Florida and the richest per capita in the US. In the early 1900’s, Henry Flagler connected them to the rest of Florida by railroad. Today, 42 bridges connect the archipelago, and many of Flagler’s original bridges have been designated as part of the Florida Keys Overseas Heritage Trail for biking, fishing and walking. The Seven Mile Bridge, south of Marathon, was an engineering marvel and the longest in the world when built.