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. See more in Season 9, Episode 7, "Mackinac Bridge." Find...
45 min - Engineering & Megastructures - HISTORY
More: Bridges & Tunnels documentaries