Eddie Butler tells the story of Barry and its island in this new series of Welsh Towns, once the biggest coal port in the world and a day trippers' paradise. But there's more to Barry's history than coal wagons and chip shops. Eddie discovers the story of the sixth-century saint who gave the town its name, finds a Tudor mural and hears about the American soldiers who camped there in the lead up to D-Day. He also learns how the series Gavin and Stacey has given Barry a new lease of life.

Eddie Butler discovers Carmarthen's hidden history of riots, crime and sporting magic. Once the largest town in Wales, Carmarthen has seen it all, from amorous Americans and cross-dressing rebels to farmers who bathe in milk.

Eddie Butler travels to Merthyr Tydfil to explore its rich, and at times, surprising history. Once the largest producer of iron in the world, Merthyr is best known for the role it played in the Industrial Revolution. But Eddie discovers another side to Merthyr, full of radicalism and innovation. From the world's first steam locomotive, to Wales's first red flag of revolution, from the seeds of the Labour Party to the birthplace of Dr Joseph Parry. Eddie reveals the events and people that have shaped this Welsh valleys town.

Eddie Butler visits Wrexham, the birthplace of football in Wales and home to the oldest international stadium in the world. Eddie discovers that Wrexham made the first successful lager in Britain and was drunk by General Gordon's troops in Khartoum. He visits a stately home to find out how another sort of butler worked and meets one of the last people to remember the tragic Gresford mining disaster of 1934. He also learns how the traditions of football and brewing are being revived.