- The Blaenavon Ironworks started production in 1789 and was to become the first purpose built multi-furnace ironworks in Wales. At that time it was on the cutting edge of technology. The furnaces were coke fired and the blast provided by a steam engine. Blaenavon is now home to one of the best preserved 18 century ironworks in Europe. It is complete with furnaces, cast houses, a magnificent water balance tower, cupola furnace, calcining kilns and ironworkers cottages. In November 2000, Blaenavon Industrial Landscape was awarded World Heritage Status, at the heart of which is the Blaenavon Ironworks.