I am quite fond of old maps and have a sustantial amount of them decorating my flat. Sadly, genuine maps and prints are really expensive and hard to find if you're looking for specific places that are off the beaten path. The University of Texas has an online collection that is quite interesting.
Here is the link to the European historical maps:

http://www.lib.utexas.edu/maps/histo...ry_europe.html

There is a link to external websites that offer other quality maps.
Enjoy.