Prado. The Prado Museum, officially known as Museo Nacional del Prado, is the main Spanish national art museum, located in central Madrid. It is widely considered to have one of the world's finest collections of European art, dating from the 12th century to the early 20th century, based on the former Spanish Royal Collection, and the single best collection of Spanish art. Founded as a museum of paintings and sculpture in 1819, it also contains important collections of other types of works. El Prado is one of the most visited sites in the world, and it is considered one of the greatest art museums in the world. The numerous works by Francisco Goya, the single most extensively represented artist, as well as by Hieronymus Bosch, El Greco, Peter Paul Rubens, Titian, and Diego Velázquez, are some of the highlights of the collection. The collection currently comprises around 8,200 drawings, 7,600 paintings, 4,800 prints, and 1,000 sculptures, in addition to many other works of art and historic documents. As of 2012, the museum displayed about 1,300 works in the main buildings, while around 3,100 works were on temporary loan to various museums and official institutions. The remainder were in storage. The museum received 2.8 million visitors in 2012. It is one of the largest museums in Spain. The best-known work on display at the museum is Las Meninas by Velázquez. Velázquez and his keen eye and sensibility were also responsible for bringing much of the museum's fine collection of Italian masters to Spain, now the largest outside Italy. The building that is now the home of the Museo Nacional del Prado was designed in 1785 by architect of the Enlightenment in Spain Juan de Villanueva on the orders of Charles III to house the Natural History Cabinet. Nonetheless, the building's final function was not decided until the monarch's grandson, Ferdinand VII, encouraged by his wife, Queen María Isabel de Braganza, decided to use it as a new Royal Museum of Paintings and Sculptures. The Royal Museum, which would soon become known as the National Museum of Painting and Sculpture, and subsequently the Museo Nacional del Prado, opened to the public for the first time in November 1819. It was created with the double aim of showing the works of art belonging to the Spanish Crown and to demonstrate to the rest of Europe that Spanish art was of equal merit to any other national school. The first catalogue of the Museum, published in 1819 and solely devoted to Spanish painting, included 311 paintings, although at that time the Museum housed 1,510 from the various royal residences, the Reales Sitios, including works from other schools. The exceptionally important royal collection, which forms the nucleus of the present-day Museo del Prado, started to increase significantly in the 16th century during the time of Charles V and continued under the succeeding Habsburg and Bourbon monarchs. Their efforts and determination led to the Royal Collection being enriched by some of the masterpieces now to be seen in the Prado.