How did I not know this before? 

https://www.rolls-royce.com/about/heritage-trust/branches/indianapolis-branch.aspx

I even knew Rolls Royce (the jet engines division) had a presence in Indianapolis. Yet, I didn't know about this museum. It's basically just 3 blocks east of Lucas Oil Stadium. Man, I need to remember it next time I'm up there. Also, some aviation fans at next year's Gen Con might like to stroll over and look.