Blaenafon Ironworks was in production from 1789 until 1902, and has the remains of six blast furnaces showing the technological development over that period.
Roedd Gwaith Haearn Blaenafon yn gweithredu rhwng 1789 a 1902, ac yno gwelir gweddillion chwe ffwrnais chwyth yn dangos y datblygiad technolegol dros y cyfnod hwnnw.