Yes @sultan-aceh, I suppose in every place people use what is more available to build. The house in my picture is an old country house like the ones they built on our island hundreds of years ago. They only had stones to build the walls, some wood from savina tree (Juniperus thurifera) for the roof as beams and on top coats of seaweed, fire ashes and clay. you can't see that in the picture, but that is how houses where made here in the old days, and they look beautiful!