If you have yet to browse through the recently added Indiana Historical Society website "Destination Indiana," you are missing a lot of good genealogical resources. The maps alone are worth the visit. It covers all of the state and Marion County is extensively covered with photos as well as maps. The URL is http://www.destination-indiana.com/
Most IHS online pages are cluttered and hard to navigate, so I'm glad this one is way more user friendly. Take a look; you'll be impressed.