I wanted to share a link with the Library of Congress that provides, among other things, Pennsylvania county maps that might be helpful to those wishing to see where ancestors lived. Not all counties have maps listed, but for those that do, this maybe a useful resource. My relatives resided in mainly Northumberland County and the map there, from 1874, listed businesses, real property owners names, coal mining areas, and the township boundaries.
If you have Irish roots and hopes of visiting Ireland to see where your ancestors lived, then you’ll want to visit the website of Joe Buggy and Shane Wilson. Their site hosts a collection of digitized street maps of Dublin and Ireland, viewable in Google map format.
Also on their site are several links to other Irish genealogy sites and of particular interest, Mr. Wilson is willing to do lookups from various Dublin directories from 1848 forward.
This site is one you’ll want to bookmark and follow for your Irish genealogy!