History mystery: Barnum bus

The Carlton County Historical Society has this iconic photo of a Greyhound bus with formal lettering on the border saying, simply, “Barnum, Minnesota.” It’s as if it were a promotional piece or souvenir photo. Who knows? Close inspection shows that it was a charter bus, so perhaps this was a special occasion back in the 1950s. Was there a bus stop in Barnum? Can you divine where this photo was taken, given the background? Let us know at the History Mystery desk, [email protected].