Architecture of Madrid of Music is a work of 1988. In the 21st century, Madrid faces new challenges in its architecture. An old industrial warehouse is the Interpretation Centre of New Technologies, and the CaixaForum Madrid (Herzog & de Meuron) was a former power station. Under the government of Alberto Ruiz-Gallardón the four tallest skyscrapers in Spain were built, and together form the Cuatro Torres Business Area (CTBA). The Manzanares River is crossed by new edge bridges, and work started on the International Convention Centre (Mansilla+Tuñón), an original round building, whose works remain paralyzed by the crisis. Caja Mágica (Dominique Perrault) sport centre
Madrid sector employs 18.1% of all employees. Madrid attracts about 8M tourists annually from other parts of Spain and from all over the world, exceeding even Barcelona. Spending by tourists in Madrid was estimated (2011) at €9,546.5M, or 7.7% of the city's GDP. The construction of transport infrastructure has been vital to maintain the economic position of Madrid. Travel to work and other local journeys use a high-capacity metropolitan road network and a well-used public transport system. In terms of longer-distance transport, Madrid is the central node of the system of "autovías" and of the high-speed rail network (AVE), which has