The Thyssen-Bornemisza Museum (''Museo Thyssen-Bornemisza'') is an art museum that fills the historical gaps in its counterparts' collections: in the Prado's case, this includes Italian primitives and works from the English, Dutch, and German schools, while in the case of the Reina Sofía, the Thyssen-Bornemisza collection, once the second largest private collection in the world after the British Royal Collection, includes Impressionists, Expressionists, and European and American paintings from the second half of the 20th century, with over 1,600 paintings.