Hundreds of fine old lighthouses stand guard at America's shores, watching over crowded harbors, maritime channels, deadly shoals, and killer reefs. Some, including the venerable towers at Portland Head in Maine, are nearly as old as the country they serve. Others, such as the one at Cape Hatteras, North Carolina have become international celebrities, and they all have a dramatic story to tell. From shore to shore, in superb photos, visit the most...