Must do in the Valleys A visit to the South Wales Valleys is an adventure. Discover some of it's top attractions to visit. A Big Pit Mining Museum B Afan Forest Park C Cyfarthfa Castle D The Bunch of Grapes E Caerphilly Castle F Sultan the Pit Pony G Waterfall country H Blaenavon Ironworks I Penderyn Whisky Distillery J Brecon Mountain Railway View full list A Valleys Adventure A green landscape and a variety of attractions within a short drive from Cardiff. Active in the Valleys Forget winter – it's finally time to get outside and have loads of fun without freezing. A world-famous heritage site Blaenavon’s industrial landscape is a living, breathing reminder of the time when Welsh coal powered the world’s industries.