Give a try to: http://magic.lib.uconn.edu/ if you are looking for old maps.
To start your journey, click the Flickr link under the featured section on this site. This will whisk you away to the complete gallery of maps. You can also browse it by year and geographic location. In order to browse by year, click the year link under the featured section. To browse by location, click the geographic location under the featured section.
Looking for someplace specific? Well then you can use the search engine at the top right of the page. For example, type in Scotland, click the Search button and it will bring up an entire list of historical maps from Scotland. Then you just click the link of the one you want to view and you’ll be whisked to its location on Flickr.
If you like maps, be warned that you will lose several hours at this site! Enjoy!