The metalsmithing skill gives you stuff for smelting, cooking gives you ovens and cauldrons, masonry gives you brick walls, yeomanry gives you palisades, leathermaking gives you stuff to make leather from skins, and many other skills will unlock structures.
sweet.
i can't wait to get leathermaking, and cooking, along with the hunting skills. I have to rely on apples all day. :c
also, a last question, how do i make stone tiles? I try to lay stone but it does nothing.