later moved from horse power to steam locomotion, and finally converting to electric trams, before closing in January 1960, in favour of motor buses. 20th century Through the 20th century, heavy industries in the town declined, leaving the Lower Swansea Valley filled with derelict works and mounds of waste products from them. The Lower Swansea Valley Scheme (which still continues) reclaimed much of the land. The present Enterprise Zone was the result and, of the many original docks, only those outside the city continue to work as docks; North Dock is now Parc Tawe and South Dock became the Marina. In the Second World War, Swansea's industrial importance made it a target of German bombing, and much of the town centre was destroyed during the Swansea Blitz on the 19, 20 and 21 February 1941 (the 'Three Nights Blitz'). In 1969 Swansea was granted city status to mark Prince Charles's investiture as the Prince of Wales. The Prince made the announcement on 3 July 1969 during a tour of Wales. Swansea obtained the further right to have a Lord Mayor in 1982. Within the city centre are the ruins of the castle, the Marina, the Glynn Vivian Art Gallery, Swansea Museum, the Dylan Thomas Centre, the Environment Centre, and the Market, which is the largest covered market in Wales. It backs onto the Quadrant Shopping Centre, which opened in 1978, and the adjoining St David's Centre opened in 1982. Other notable modern buildings include the BT Tower (formerly the GPO tower) built around 1970, Alexandra House opened in 1976, County Hall opened in July 1982. Swansea Leisure Centre opened in 1977; it has undergone extensive refurbishment which retained elements of the original structure and re-opened in March 2008. Governance The "City and County of Swansea" local authority area is bordered by unitary authorities of Carmarthenshire to the north, and Neath Port Talbot to the east. The Urban Subdivision of Swansea covers all urbanised areas within the city boundary, with a population of 179,485, it is considerably smaller than the unitary authority. The local government area is in size, about 2% of the area of Wales. It includes a large amount of open countryside and a central urban and suburban belt. Local government In 1887, Swansea was a township at the mouth of the river Tawe, covering in the county of Glamorgan. There were three major extensions to the boundaries of