Madrid is the capital of Spain and the largest municipality in both the Community of Madrid and Spain as a whole. It is the third-largest city in the European Union (EU) after London and Berlin, and its metropolitan area is the third-largest in the EU after those of London and Paris.
Whilst Madrid possesses modern infrastructure, it has preserved the look and feel of many of its historic neighbourhoods and streets. Its landmarks include the Royal Palace of Madrid; the Royal Theatre with its restored 1850 Opera House; the Buen Retiro Park, founded in 1631; the 19th-century National Library building (founded in 1712) containing some of Spain's historical archives; a large number of national museums, and the Golden Triangle of Art, located along the Paseo del Prado and comprising three art museums: Prado Museum, the Reina Sofía Museum, a museum of modern art, and the Thyssen-Bornemisza Museum, which completes the shortcomings of the other two museums. Cibeles Palace and Fountain have become one of the monument symbols of the city. Madrid is the most visited city of Spain.