Get a taste of both history and natural beauty with a visit to Dry Tortugas National Park. It’s located nearly 70 miles west of Key West, and the only way to get there is by boat or seaplane. Yet it’s worth the trouble. The 100-square-mile park features seven small islands surrounded by crystal-blue waters, coral reefs and abundant marine life. The centerpiece is Fort Jefferson, and guests can take a tour of one of the largest 19th-century forts in the country. It’s located on Garden Key, the hub of the park’s activity.