One of 32 local authorities, Glasgow is the largest city in Scotland, with a total area of 78 square kilometres and a population of 578,790 (2005). It stands on the banks of the Clyde and was during the 19th and early 20th centuries one of the industrial powerhouses of the United Kingdom. Its post-Second World War economic decline was overcome in the 1980s when the city began to transform itself into an artistic and cultural haven. In 1990 Glasgow was named European City of Culture and began a highly successful process of regeneration through the arts. It is often cited as a 'model' of how a decaying western European city can reinvent itself. Two million tourists visit its galleries, theatres and arts venues every year, and it is home to several national Scottish companies and organisations such as Scottish Opera, Scottish Ballet and the Royal Scottish National Orchestra (RSNO), the well-known Citizens Theatre and the Burrell Collection. It was also the home of architect, designer and artist Charles Rennie Mackintosh. His iconic Glasgow School of Art (1896) heralded a new form of architecture for the 20th century. Other examples of his work are the Willow Tea Rooms and nearby Hill House (see Arts and crafts and after). Glasgow is a multicultural city with a greater mix of ethnic communities than anywhere else in Scotland and the Glasgow Mela is a major feature of the local calendar. Glasgay! also has a unique international reputation. The city has the largest concentration of Gaelic speakers outside the Western Isles.