PRONI House Have Released The New Historical Map Viewer And It's Awsome

Click the link and then you will be taken to a modern map of Northern Ireland, much the same as google maps. Zoom into the area you want to view. There is a tab on the top right hand side that looks like layers on-top of each other. Once you click that you can tab in and out of different eras of ordnance survey maps. It becomes very addictive to see areas you know and what they looked like as far back as 1832.