Hirfynydd Sarn Helen (UK)
A rugged out-and-back along the 2,000-year-old Sarn Helen Roman Road across Hirfynydd. It links the Roman-history hub of Banwen - a candidate birthplace of St Patrick - to the B4242 on the far side of the mountain, where a stone milestone marks the turnaround. Expect true mountain trail with scree/talus sections, boggy hollows, forestry edges, and exposed moor. One half looks toward the high Beacons - Corn Du, Fan Hir, Fan Brycheiniog - the other drops views over the Neath Valley, Swansea, and the bay.