Scotland has probably the best Celtic buildings that can be found in Europe, the most important is a stone village called Skara Brae - Orkney (3100 BC).
There are also a large number of "Duns" stone towers, such as Dun Charlabhaigh - Isle of Lewis (200 -800 AD). On the islands there is a very high concentration of Standing Stones, the most famous are Calanais - Isle of Lewis (3000 BC) and the Ring of Brodgar - Orkney (2000 - 2500 BC).
