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Until recently, the Mackinac Bridge was the longest suspension bridge in the world. One of the top engineering marvels of the 20th century, the bridge spans the 4-mile wide straits of Mackinac, where Lakes Huron and Michigan come together . The Mighty Mac connects the pastoral northern mainland of Michigan with the state's heavily forested Upper Peninsula and stands as a testament to the dreams, determination, and hard work of a small few who created a true masterpiece of modern engineering.