There's a treasure trove of information hidden away on Indianapolis' official city website. Look at the upper right hand corner of the opening page, and you'll see "site map". Click on it.
This will bring up a list of options. Scroll down to the "Metropolitan Development" section, and click on "resources". Here, click on "maps".
This Indianapolis Observer loves the access to current and historical aerial photography collection. Click GIS General Data Viewer and start exploring.
Want a contour map of your neighborhood? The county's ZIP code boundaries? Even a close up historical photo of your house? It's all here. Click to zoom in on a particular location. Enjoy!