Abercraf (also Abercrâf; or Abercrave) is a village in Powys, Wales, in the community of Ystradgynlais and within the historic boundaries of the county of Brecknockshire.
Between 1965 and 1991, the village was the location of a Royal Observer Corps monitoring bunker, to be used in the event of a nuclear attack. It remains mostly intact.[1]