Pen y Fan poor weather. There is also a major path from the Cribyn, a close-by peak to the east. The Storey Arms is an outdoor education centre beside the A470, the main trunk road between the north and south of Wales, in the Brecon Beacons National Park near Libanus, Powys, Wales. Run by Cardiff City Council since 1971, the residential centre can accommodate up to 58 people. Its activities include kayaking and canoeing, caving, hill walking, rock climbing and white water rafting. The centre is at above sea-level, along the pass between Pen y Fan and Fan Fawr, at the foot of
Pen-y-Gwryd Plas y Brenin. The Old Miners' Track from the Snowdon copper mines are now part of the modern A4086 road between Pen-y-Gwryd and Pen-y-Pass. It continues northwards beyond Pen-y-Gwryd skirting Glyder Fach to Bwlch Tryfan and Dyffryn Ogwen. From Pen-y-Pass is the "PYG track", one of the many routes leading to the summit of Snowdon, its name is believed be derived from the initials ("P-y-G"). However, older maps show it as the "Pig track", a name derived from "Bwlch y Moch" (the Pigs' Gap). During Roman Britain, the Roman Army built a marching camp at the head of Dyffryn Mymbyr