Podcast: a spring walk to explore the dark history of Llangorse Lake in the Brecon Beacons

Surrounded by mountains, woods and meadows, Llangorse is Wales' most beautiful natural lake – but do its depths hide a secret? Fergus Collins goes in search of a mystery monster and discovers a watery wildlife paradise thronging with birdsong. But just what is 'Gorsey'?

And don't miss our extended guide to the Brecon Beacons