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 zones of urbanisation can be distinguished: The largest suburbs are to the South, and in general along the main routes leading out of Madrid. "Submetropolitan areas" inside Madrid metropolitan area: Little medieval architecture is preserved in Madrid, mostly in the Almendra central, including the San Nicolás and San Pedro el Viejo church towers, the church of St. Jerome, and the Bishop's Chapel. Nor has Madrid retained much Renaissance architecture, other than the Bridge of Segovia and the Convent of Las Descalzas Reales. Many of the historic buildings of Madrid date from the Spanish Golden Age, which coincided with the Habsburgs