The Industrial Revolution of the 1790s, which spurred mining in South Wales' valleys, is the origin for Cardiff's history. The Glamorganshire Canal was also built in 1794, which carried down iron and coal from the valley. With the growth of the industry, it became clear that a more efficient transport was needed and the Taff Vale Railway was opened in 1840. The increasingly growing trade in iron and coal was also the reason for many docks in the Victorian era. Butetown and the surrounding dockland have during this period become a cosmopolitan city of seafarers from around the world who made Cardiff their home. In the 1880s Cardiff had been the largest city in Wales, and its harbour handled more coal than any other harbour in the country. Coal shipments hit a record of 13 million tonnes on the eve of the First World War in 1913. At this point in the construction of the Coal Exchange, the global price of coal had reached their peak too, and here in Cardiff Bay, the world’s first £1 million deal was signed. However, demand for coal plummeted after the Second World War, as other countries were establishing their steel industries, foreign markets were lost. Trade-in container ports were declining and coal exports almost stopped in the 1960s. East Moors Steelwork ended in 1978 with the loss in South Cardiff of 3,200 jobs. By the beginning of the 1980’s, Cardiff Bay was a wasteland of abandoned docks and dock warehouses. Therefore, the history of Cardiff Bay is very much alike to London's Dockland. The Cardiff Docklands area is known today as Cardiff Bay and has been converted into a large freshwater lake by the Cardiff Barrage, which combines the Rivers Taff and the Ely. There are some other important sights such as the Techniquest Science Discovery Centre, Craft in the Bay, the Welsh Assembly at Pierhead, Butetown History and Arts Centre, the Norwegian Church Arts and the Wales Millennium Centre. The Red Dragon Centre provides unique entertainment opportunities for family fun in the heart of the city.