Michigan's two peninsulas were finally connected in 1957, after 20 years of planning, and close to $100 million in construction and engineering costs with the construction of a bridge crossing the Straits of Mackinac.
But the work didn't stop there. Something this beautiful and majestic needs constant upkeep. This engineering marvel needs constant maintenance, cleaning and re-coating. In 2016, it was time for a major sandblast and painting.
