IICascade House E of the main village development, on the N slope above Nant y Cascade, set within landscaped grounds, surrounded by farmland and reached by a drive.
IIChurch of Holy Trinity A472 skirts the W side of Ystrad centre; church is set back from the road on a knoll within a very hilly walled churchyard which falls away steeply to W and S, main entry at SE through lychgate.
IIChurch of St Catwg Fronting the main crossroads in the village centre, within a churchyard which backs onto the site of Gaer Fawr, a Roman Fort.
IIHoreb Baptist Church Located in a terrace of cottages next to Gelligaer graveyard, a very small front courtyard being formed by iron railings and gate.
IILlanbradach Fawr Situated on the mountainside on the W slope of the Rhymney Valley, SW of Ystrad Mynach, and reached by a long lane from Llanbradach to S.
ILlancaiach-fawr Close to the W community boundary which follows Nant Caeach, a short distance NE of Nelson and reached by a short track from the main road. Fronts a re-created formal garden, the surrounding walls inc
IIMill Forge On the southern border of Ystrad Mynach, on the W bank of Rhymney River, fronting the thoroughfare.
IIOld Fire Station Originally situated off Park Road but now resited in grounds of Caerphilly County Borough Council offices at Ystrad Fawr, to W of main house.
IIPen-heol-Adam NE of Gelligaer village, on high farmland near the open moorland of Gelligar Common, reached by a short track from the (Roman) road.
II*Penallta Colliery Baths Building Situated between Ystrad Mynach and Gelligaer, on the east side of Penalltau Road. The Baths Building faces Penalltau Road, on the west of the complex.
IIWar Memorial Just off Caerphilly Road in a square to the north of Ysbyty Ystrad Fawr, approx. 50m W of the Old Fire Station (rec no 13569).
IIYstrad Mynach South Signal Box To the south of Ystrad Mynach station on the west side of the tracks off a rough lane from Twyn Road. Private property.
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