The Reina Sofía National Art Museum (''Museo Nacional Centro de Arte Reina Sofía''; MNCARS) is Madrid's national museum of 20th-century art and houses Pablo Picasso's 1937 anti-war masterpiece, ''Guernica''. Other highlights of the museum, which is mainly dedicated to Spanish art, include excellent collections of Spain's greatest 20th-century masters including Salvador Dalí, Joan Miró, Picasso, Juan Gris, and Julio González. The Reina Sofía also hosts a free-access art library.