Hello,
Rock Baptist Chapel is off the Crossgates - Llandewi Ystradenny road, with a sign leading to a very steep road to a parking area. There are two parts to the graveyard on either side of the chapel. The older part contains quite a few Griffiths, Rogers and other common names of the area. Most of the stones are in bad shape and a census of the whole area is urgently needed. The Powys Aarchives in Llandrindod has the listing of graves and will only provide single enquiries on request.
I was at Rock Chapel last October (2010) and spent a very worthwhile time recoding those stones that fittedmy family research.
John E. Jones