Interested in taking a look at your ancestors' world from the viewpoint of historical maps? Take a look at Maproom.org. The site allows visitors to zoom into historical maps of the world, most scanned from atlases.
I found the 1880 Hungarian A Magyar Szent Korona Országainak Megyei Térképei by Hátsek Ignácz helpful. Its maps of Borsod and Zala counties gave me a good look at the areas where different branches of my family lived at the end of the 19th-century. The names of neighboring villages that I found may help me to track down vital records for family members who attended church outside their own towns.
If you exhaust Maproom.org's collection (which would not be easy to do) you'll want to visit their large list of links to other map sites online.
Enjoy your trip back into history!
Thanks to Julianna Smith's article at 24/7 Family History Circle for mentioning the 1880 Hungarian atlas online at Maproom.org.