Around the coast of Dingle we ran into these pre-historic mounds - the forerunner to all the Irish dry fit stonework that is used to make walls.
Not sure how warm these things would have been, but they were meticulous.
This area is considered one of the earliest places in Ireland where people actually settled, but looking around at all the steep cliffs and freezing rain from the coast, I'm not sure if it wouldn't have been a better idea to move inland just a touch - like 500 feet.