Huge Abandoned Island Fortress In Florida

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Seventy nautical miles off the coast of Key West in Florida is a series of seven islands set among a graveyard of over 200 ships, crowned with a massive 19th century fortress that lay abandoned for nearly a century. The Dry Tortugas once hosted Spanish explorer Ponce de Leon and an influx of marauding pirates; today it's a bird and wildlife sanctuary and a national park.