Well you're in for a treat. The tywi valley and surrounding area is gorgeous and full of barely seen sites - some of which are substantial, beautiful and wierd and i suspect there are more to be discovered. It seems all to centre on the burial tomb at gelli - an unusual lowland location for a welsh barrow.
If you are around there, I'd appreciate if you would check out this:
http://www.themodernantiquarian.com/site/8965/ty_newydd_stone_row.html
we reported it to the officials for confirmation and also the Cefn Gwyrnedd stone circle
http://www.themodernantiquarian.com/site/8967/cefn_gwernffrwd_complex.html
which needs monitoring as it seems about to disappear..
t