If you've never perused the Ohio State University Libraries website, I encourage you to do so. In particular, you'll find some great information and images of Ohio Field and Ohio Stadium.
The Shoe hosted its first game as Ohio State battled Ohio Wesleyan on October 7, 1922 with the formal dedication occurring during that season's Michigan game.
Like any stadium around that long, the structure has undergone its fair share of renovations and changes including seating expansion, a lowered field, numerous playing surfaces, scoreboard changes and expanded luxury seating to name a few.
Thankfully, not every suggestion to modify Ohio Stadium has come to pass.