Durham County Council has an excellent site for maps of County Durham from the 1850s up to the present day, with various types of search. You can zoom in and out and pan the maps.
Durham County Council's Geographic Information System (GIS) is an interactive mapping service which we have developed to enhance our website. The GIS allows you to interact with both modern and historical maps of County Durham and the immediate surrounding areas.
http://gis.durham.gov.uk/website/interMAP/viewer.htm
Stan
This GIS mapping system is an excellent idea but I'm finding it difficult to use. Panning right took me to France, the scroll/panning tool doesn't work the same way the 'hand' usually does on maps, you need to know exactly where to make the box to 'enlarge' a particular area.

I will persist as I think this is potentially very useful, but I'm not too impressed so far. Perhaps more practice and understanding of the GIS mapping foibles is required.
