St Martin's Church at Cwmyoy dates back to the 12th Century, although most of its current structure dates to the 14th Century. It's most distinct feature is its crooked alignment caused by landslips occurring in the mediaeval period, which has cause it to be know as "the most crooked church in Britain". Above the church, the gap in the side of the mountain from which the landslide originated is still visible. This gives rise to the name of the village of Cwmyoy - "the valley of the yoke".

Inside the church, there can be found a mediaeval stone carving of Christ on the cross. This dates back to the 13th Century, and is believed to be a rare survivor of the crosses placed along the Cistercian Way - a pilgrim route which led from Gloucester to St David's.

St Martin's Church at Cwmyoy is located in remote spot up the side of the Vale of Ewyas. It's a beautiful spot, quiet and unspoiled, surrounded by glorious countryside. The angles of the church make it extremely unusual, and once inside, the twisted nature of the building creates an odd sensation not unlike being on a ship at sea. A fantastic place to visit.