El Viso (Spanish pronunciation:[elˈβiso]) is a neighborhood of Madrid, part of the Chamartín District. Consisting mainly of residential detached houses, it is currently the wealthiest neighborhood of the Spanish capital,[1][2] overtaking the Salamanca District. Aristocrats, businessmen, politicians and diplomats have inhabited this area for half a century. The neighborhood also hosts the main headquarters of the Spanish National Research Council (CSIC).[3]