Fun Attractions in Ohio?

Me and my boyfriend want to go on a little mini roadtrip through Ohio. We live in Columbus and we're looking for somewhere fun and worth a visit. We went to the Ohio Indian Caverns but other than that, Ohio is looking pretty boring. Any suggestions of fun places that we could visit? Its too cold for theme parks... show more Me and my boyfriend want to go on a little mini roadtrip through Ohio. We live in Columbus and we're looking for somewhere fun and worth a visit. We went to the Ohio Indian Caverns but other than that, Ohio is looking pretty boring. Any suggestions of fun places that we could visit? Its too cold for theme parks also, so mainly attractions indoors?
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