It is kind of silly to have Ohio State University on TripAdvisor as a tourist destination. However, if you are in Columbus, you can do worse than visiting the OSU campus. The Oval is great once it is warmer, and full of students playing frisbee, sunbathing etc. Short walk from there takes you to the Mirror Lake, with some great ice cream nearby (you can find the place by giant ice cream cone). Lots of other nice things to see, the new Library and Student Union are nice.