The Prado Museum 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.