The trinity of websites used in digital heritage research in Ireland are
2. www.osi.ie
3. maps.google.ie
This is a short video showing how to get into, and perform a search in, www.archaeology.ie. We have these three sites open in separate web browser tabs all of the time. If you know the townland name for the site you are researching then do a townland query or I often jsut search by zooming into the map and clicking on the most likely red spots (registered archaeology sites).