Grandma's Marathon at 50: How Duluth's 26.2-mile race became one of nation's most popular

Thousands of runners spread out near the starting line of Grandma's Marathon, which begins in Two Harbors and follows the North Shore of Lake Superior to the finish line in Duluth. It's the 10th largest marathon in the U.S.
Courtesy of Grandma's Marathon
Go Deeper.
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