Cardiff is the capital, largest city and most populous local authority of Wales in the United Kingdom. The city is Wales' chief commercial centre, the base for many national cultural and sport institutions, the Welsh national media, and the seat of Welsh Assembly Government (although its various offices are distributed throughout Wales). According to recent local government estimates, the population of the unitary authority area is 317,500. The city of Cardiff is the county town of the historic county of Glamorgan (later South Glamorgan). Cardiff is part of the Eurocities network of the largest European cities. Cardiff Urban Area covers a slightly larger area, including Dinas Powys, Penarth and Radyr. A small town until the early 19th century, the city came to prominence as a major port for the transport of coal following the arrival of industry in the region. Cardiff was made a city in 1905, and proclaimed capital of Wales in 1955. Since the 1990s Cardiff has seen significant development with a new waterfront area at Cardiff Bay which contains the new Welsh Assembly Building and the Wales Millennium Centre arts complex. The city centre is undergoing a major redevelopment. International sporting venues in the city include the Millennium Stadium (rugby union and football) and SWALEC Stadium (cricket). Cardiff is a significant tourist centre with 11.7 million visitors in 2006, making it the most popular visitor destination in Wales.