Howdo Gyrus,
Galicia, you lucky bugger. I've not been to Galicia but if I were to go there, apart from the beautiful rock art I would also check out a few of the hundreds of castros over there. Some of the decorated slabs of the sauna baths over there are outrageously carved.
http://www.uwm.edu/Dept/celtic/ekeltoi/volumes/vol6/ 6_3/gonzalez_ruibal_6_3.html">http://www.uwm.edu/Dept/celtic/ekeltoi/volumes/vol6/ 6_3/gonzalez_ruibal_6_3.html
http://www.uwm.edu/Dept/celtic/ekeltoi/volumes/vol6/
Coincidentally or maybe not there was a La Coruna was once called Brigantium.
It also may be worth asking Julian to put you in touch with Annexus Quamm