Fan y Big the edge of its precipitous western face. The view of this face from Cribyn is regarded as very striking. Fan y Bîg has since lost its mountain status. The peak is prominent on the north facing escarpment of the central part of the Brecon Beacons and several footpaths cross the summit. All the surrounding land is open access and so walkers can go where they wish. In poor weather however, the paths are the safest route for access. The peak is often crossed by hikers aiming for Cribyn, Pen y Fan and Corn Du, and also forms part of the
Pen y Clawdd Castle a medieval fortified site rather than a castle. Pen y Clawdd Castle Pen y Clawdd Castle is a ditched mound with a double moat, roughly circular in shape, with a diameter of approximately 28m to 30m and about 2.4m high. The castle is in Llanvihangel Crucorney, about five miles to the north of Abergavenny, Monmouthshire, in south east Wales and lies between the Usk and Monnow rivers. The mound was designated a scheduled monument in 1950 and described as a defensive medieval motte. The castle mound is adjacent to Pen-y-Clawdd Court (a Grade I listed building), a stable and cowshed