It's in East Lansing.
My fist Michigan State vs Michigan game was in 1966 during my senior year in high school. The game was in Spartan Stadium. A friend of mine, from our high school football team, got student tickets through his cousin. More than 78,000 watched MSU defeat Michigan 20-7. We sat on the field in the area now frequently filled with photographers.
The most memorable part was meeting Bubba in the locker room after the game. Our running back was being recruited by MSU. He and our coach were being given the royal treatment. Our coach was kind enough to invite my friend (who later played football at NAVY) and me to tag along. The MSU staff assumed we were being recruited also; we didn't disabuse them of that notion. The image of Tody Smith sitting on Bubba's knee, with both wearing nothing more than jock straps, is etched in my brain. As we were introduced, I shook Bubba's huge hand.