I don't know, haven't looked yet. My "rule" very loosely defined is I need to visit at least two places or do something significant in the state or spend a significant amount of time to mark the state off my map. I've not researched IA yet and other than Toppling Goliath Brewing not sure what might appeal (the Brewery is a bit out of the way). Capital Cities are usually interesting -at a minimum I can visit the Capitol or State museum; I realized on last year's trip, I've hit many so might try to incorporate more going forward but they are not a priority. Do you have any suggestions?
I often seek out unique geography, kitch/roadside oddities, interesting small specialty museums in tiny towns, regional specialties or festivals/fairs if the timing works out.... and love breakfast in small town diners where the working folk go and I can overhear small talk. I sometimes have a "must" do but usually have a list of 3-10 things at a place I am stopping to explore and decide on the fly based off my mood and weather forecast. My favorite things usually are not things I knew about when planning my trip and are things that stumbled into or found on Google maps when close.