Route
From Dolwyddelan station car park turn left, cross the railway bridge and bear right alongside the railway. In 100m take the track on your right as the road bears left. Follow this track beside the railway until you reach a gate. Here the railway curves to the right of a hill whilst the path goes to the left. Follow the surfaced path over a small brook. Pass through a farm and beside an old stone barn to reach a style over a fence. The path crosses open fields to reach another style; here cross a brook to enter a spinney at a disused quarry. You then cross over a small stone footbridge and follow the stone paved footpath through the woods. The path rises gently to reach a style over a fence. At this point you can see Dolwyddelan Castle across the valley. The path then descends through a gate and continues to the farm buildings at Bertheos.

Follow the path to the right, in front of the old ruined cottages and you immediately reach two gates. Take the gate straight ahead which is way marked A470. Walk in front of the farmhouse taking the track downwards, cross the railway bridge and turn left at the main road, following this un till you reach a road on the right, signposted 'Roman Bridge'. Turn here and walk past the railway station, following the road gently uphill  then round to a hairpin bend.

Turn sharp right with the lane, cross the railway, then the river and walk uphill for about 400 yards to a sharp left bend at Pen-y-Rhiw. Turn right here, along the wide track through the farmyard and walk uphill. Follow the track through several gates and styles un till you see Dolwyddelan Castle ahead of you. Remain on the track (castle to your right) and continue ahead to find a footpath on your right. This leads down past farm buildings to the front entrance to the castle. Follow the road down to the A470 and turn left, back to Dolwyddelan. At the post office turn right and walk down through the village, over the river bridge back to the station.

Map - click to enlarge