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
Architecture of Madrid and the Thyssen-Bornemisza Museum, which completes the shortcomings of the other two museums. Cibeles Palace and Fountain have become the monument symbol of the city. The architecture of Madrid reflects a number of styles from various historical periods. Very little medieval architecture is preserved in Madrid, and most of it is located inside the Almendra central. Historical documents show that the city was walled and had a castle (the Alcázar) in the same place where the Royal Palace now stands. Among the few preserved medieval buildings are the mudejar towers of San Nicolás and San Pedro el Viejo churches, the