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
Siege of Madrid as part of the Nationalist's campaign to take the capital: in March, at Guadalajara and at the end of December at Teruel, both north east of Madrid. In the first of these battles, in early 1937 Franco tried to cross the river Jarama to cut off the road between Madrid and Valencia, where the Republicans had moved their government. The battle's results were inconclusive. Franco's troops managed to get onto the east bank of the Jarama but failed to sever communications between Madrid and Valencia. Casualties on both sides were heavy, estimates of their losses ranging from 6,000 to 20,000