IIAgricultural Range known as 'the Barn' at Heol-ddu Heol-ddu is situated nearly 1km NW of Foelgastell, midway between Cefneithin and Porthyrhyd. This building lies on the NE edge of the farm complex and it faces the main farmhouse.
IICapel Seion On a hilltop site, 1km west of Drefach, in the hamlet named after the chapel. Large stone-walled graveyard; detached vestry to east of chapel.
IIFormer Dwelling to Rear of Heol-ddu Heol-ddu is situated nearly 1km NW of Foelgastell, midway between Cefneithin and Porthyrhyd. This building is on the SW edge of the farm complex behind and a little to one side of the farmhouse; both
IIHeol-ddu farmhouse Nearly 1km NW of Foelgastell, on the B4310 midway between Cefneithin and Porthrhyd. The farmhouse faces away from the road towards the farmyard; small forecourt with low rubble wall. Small walled enc
IILimekiln at the south-east of Castle Quarry 2km north of Drefach village and 500m SE of Maes-y-mwnwns farm. Castle Quarry is to the south side of a minor road east from the B4310. This kiln stands at the south-east edge of the quarried area.
IILimekiln at the south-west of Castle Quarry 2km north of Drefach village and 500m SE of Maes-y-mwnwns farm. Castle Quarry is to the south side of a minor road east from the B4310. This kiln stands at the south-west of the quarried area.
IIRoadside Limekiln at Castle Quarry 2km north of Drefach village and 500m south-east of Maes-y-mwnwns farm. Castle Quarry is to the south side of a minor road east from the B4310. This kiln stands at the roadside.
IIStables at Heol-ddu Heol-ddu is situated nearly 1km NW of Foelgastell, midway between Cefneithin and Porthyrhyd. This building lies at right angles and to the SE of the main farmhouse. Walled garden to its rear.
IIWalled Garden at Heol-ddu Attached to the south-east of the farmyard of Heol-ddu, the rear wall of the stable forming part of one wall.