The Detroit Lions host the Green Bay Packers this Sunday at Ford Field for the first of two divisional meetings. Wikipedia notes that the longest continuously-running NFL rivalry is the Lions vs Packers. They first met in 1930 when the Lions were known as the Portsmouth Spartans (they were based in Portsmouth, Ohio until they moved to Detroit in 1934 season). They’ve been division rivals since 1933 and have always met at least twice a season since 1932, without any cancelled games.
As Ann notes, that rivalry is no contest in Marquette. Thought it may be in Michigan, the U.P. is Packers territory.
Lots more Detroit Lions on Michigan in Pictures.