I just got back last weekend from a holiday on the west coast of Ireland. I had a brilliant time even though the weather was so unsettled. We stayed in County Galway and managed to get to quite a few places - one of the places I went was to the Isle of Inis Mor just off the west coast and whilst I was there I went to visit Dun Aonghusa, an ancient hill fort which is supposed to have links with the Tuatha de Danaan. They are not sure who built it. It was amazing !
http://www.shee-eire.com/Sites&Monum.../dun-ainfo.htm

Unfortunately I didn't spot Adam or anyone else there. It started raining as I reached the top of the hill and didn't stop all day, which meant I couldn't see out over the ocean. The fort is incredible though, I always get prickles up my spine when I visit somewhere that is so old.