Yager Stadium (Miami) - Recent renovations have made it pretty nice, we just need some fans
Ohio Stadium (OSU) - The Shoe was neat, the ushers were annoying though since we couldn't squeeze into the band section
Michigan Stadium (Michigan) - Weirdly looks smaller on the inside, the new press boxes helped make it louder than most people think
Memorial Stadium (Illinois) - Was pre-renovation but it was during the Rose Bowl season so it was a nice atmosphere
Nippert Stadium (UC) - I'm jealous of UC for having Nippert, it's pretty damn close to being the Wrigley of college football
Paul Brown Stadium (UC for a season) - Standard pro stadium, was miserable since Miami was in the middle of our 20+ game losing streak
Faurot Field (Mizzou) - During the Big 12 days, still nice to see
Plaster Stadium (Missouri State) - Pretty bland and full of concrete, not very exciting

Neutral sites:
Edward Jones Dome (multiple Illinois-Mizzou games) - These games were rockin' back in the day
NRG Stadium (2010 Texas Bowl) - Neat to see RGIII in a bowl, though Illinois killed
Tropicana Field (2016 St. Pete Bowl) - Never mention this game again

Seen from the outside:
Kinnick Stadium (Iowa)
Camp Randall Stadium (Wisconsin)
Memorial Stadium (IU)
Memorial Stadium (KU)
Memorial Stadium (Cal)
Liberty Bowl (Memphis)
Raymond James Stadium (USF)
Astrodome (Houston)
Doyt Perry Stadium (Bowling Green)
Arrowhead Stadium (neutral)

Miami is playing at Army this fall, I'm hoping to make it to West Point for that. Was pissed I couldn't make it to Notre Dame this past season. Would love to see the Rose Bowl at some point, though I seriously doubt I'll have the chance to see Miami there...