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Measured the conventional way, between towers, Mackinac Bridge is the world's ninth longest suspension bridge. Measured by impact, it ranks right up there with the Golden Gate Bridge. Learn about family vacations to the so-called Mighty Mac.
The Great Barrier Reef, situated along the northeastern coast of Australia, is a marine ecosystem unrivaled by any other in the world. Renowned for its natural, unchanged beauty, it is visited by millions of tourists every year. Take this quiz to learn more about this natural aquatic wonderland.