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Madrid is the capital and largest city of Spain. Its economic, political, and cultural importance mark it as one of the major cities of the world. Residents are called Madrileños. The population of the city was 3.5 million (December 2005), while the estimated urban area population was 5.5 million. While Madrid possesses a modern infrastructure, it has preserved the look and feel of many of its historic neighborhoods and streets. Its landmarks include the huge Royal Palace of Madrid; the Teatro Real (Royal theatre) with its restored 1850 Opera House; the Buen Retiro park, founded in 1631; the imposing 19th-century National Library building (founded in 1712) containing some of Spain’s historical archives; an archaeological museum of international reputation; and three superb art museums: Prado Museum, which hosts one of the finest art collections in the world, the Museo Nacional Centro de Arte Reina Sofía, a museum of modern art, and the Thyssen-Bornemisza Museum, housed in the renovated Villahermosa Palace.