Dating back to The Iron Age, these primitive fortress were designed and but on the uneven and craggy overlooks of cliffs and coastal areas. Seen Worldwide, in Europe- they appear to have been a popular defense design in Ireland and England. Constructed of individual stone pieces, Promontory Forts were reinforced by wood (inside at the foundation). Often slopping downwards, they serve more as “lookout points” than defensive structure. They probably featured wooden and thatched roofs. Roman invasion documents mention them as far back as 56 B.C.