Many of our ancestors came from Europe to or through Pennsylvania early in the last century. There are some pretty good electronic map collections of Pennsylvania on line. You can explore these a bit for a glimpse of the Pennsylvania as the knew it.
A large (1770kb) overall map is at fermi.jhuapl.edu/states/1895/pa_1895.jpg Which shows a much smaller Pittsburgh than we think of today. Unfortunately it seems to show major roads but not the railroads that were likely our ancestor's mode of travel. A larger view of the Allegheny County / Pittsburgh area is at www.livgenmi.com/1895/PA/County/allegheny.htm which also leads to indexes of other parts of the US in 1895.