This derelict abandoned chapel, or church, in Snowdonia is to be found in Blaenau Dolwyddelan.
The chapel is located at the bridge of the Pont Rufeinig road over the Ceunant Ty'n y Ddol river. I believe it may have been built by the navvies who built the Blaenau Ffestiniog to Blaenau Dolwyddelan Railway Tunnel as a place of worship.