Highway 61 traces approximately 440 miles through Minnesota, from Pigeon Falls at the Canadian border south to La Crescent. Along the way, the road hugs the North Shore, zips through St. Paul, and navigates bluffs along the Mississippi River. While places such as Split Rock Lighthouse or Sugar Loaf Mountain offer well-documented stopping-off points, observant travelers may wonder about historic buildings, abandoned sites, and decaying structures they...