The Newberry Library announced this week a new interactive on-line map for genealogists.
You can enter any address and the interactive map will give you a list of places where you might be able to find information about your great great great-grandpa, or the person who lived in your house in the 1800s.
It's pretty cool.
Check it out at Chicagoancestors.org.
Mark Konkol covers city neighborhoods for the 
That's awesome! Thanks for the info.