Hidden Histories - Series 2 - Episode 4

Narrated by Huw Edwards, this series investigates the little-known aspects of Welsh history. There's the house that time forgot near Raglan, a visit to the best preserved World War I training trenches at Penally in Pembrokeshire, and a look at new plans to open a visitor centre at Parys Mountain in Anglesey, once the biggest copper mine in the world.