The Mackinac Bridge, which connects the upper and lower peninsulas of Michigan, is, at around 5 miles, the longest suspension bridge in the Western Hemisphere.
In 1958, when it turned a year old, the Mackinac Bridge Walk began. Each Labor Day since, anywhere from 40,000 to 90,000 folks, led by the current governor, walk from the upper to the lower peninsula.
I did it yesterday, thought it was pretty awesome.
Anyone else ever do it?