Penwyllt Wikipedia
Penwyllt (Welsh: "Wild Headland") is a hamlet located in the upper Swansea Valley in Powys, Wales.. A former quarrying village, quicklime and silica brick production centre, its fortunes rose and fell as a result of the Industrial Revolution in South is now an important caving centre.. Beneath Penwyllt and the surrounding area is the extensive limestone cave system of Ogof Ffynnon Ddu ...