Cardiff in making iron and later steel, brought to the sea by packhorse from Merthyr Tydfil. This was first achieved by the construction of a long canal from Merthyr (510 feet above sea-level) to the Taff Estuary at Cardiff. Eventually the Taff Vale Railway replaced the canal barges and massive marshalling yards sprang up as new docks were developed in Cardiff – all prompted by the soaring worldwide demand for coal from the South Wales valleys. At its peak, Cardiff's port area, known as Tiger Bay, became the busiest port in the world and – for some time – the world's
History of Cardiff the Cae'rarfau Chambered Tomb, Creigiau (about northwest of Cardiff City Centre) and the Gwern y Cleppa Long Barrow, near Coedkernew, Newport (about northeast of Cardiff City Centre)—shows that these Neolithic people had settled in the area around Cardiff from at least around 6,000 BP, about 1500 years before either Stonehenge or The Egyptian Great Pyramid of Giza was completed. In common with the people living all over Great Britain, over the following centuries the people living around what is now known as Cardiff assimilated new immigrants and exchanged ideas of the Bronze Age and Iron Age Celtic cultures. Together with