There are quite a few cottages at Halfway which seems to string itself out along the A40 for quite a long way. One of the cottages there - Tre Nicholas - does have links with the Nicholas family of Trecastle and I am sure that there will be links with other cottages too. As Garfydd says, there is a derelict chapel which can be accessed from the main road. Flowers are still placed on the graves there so there so it is not a totally forgotten area.
Regards
GS