Geograph - photograph every grid square

See SY1892 : Banks and ditches of the Iron Age hillfort of Blackbury Camp; this area can be seen in the right background, but on a far gloomier day, in steady rain. This shows the "Barbican", an unusual triangular addition to the south entrance. "We do not know whether the outer enclosure at Blackbury was intended to be defensive or whether it had a practical use, perhaps as a holding area for cattle" Link .