The Museo Nacional Centro de Arte Reina Sofía (MNCARS, also called the Museo Reina Sofía, Queen Sofía Museum, El Reina Sofía, or simply The Sofia) is Spain's national museum of 20th-century art. The museum was officially inaugurated on September 10, 1992, and is named for Queen Sofía. It is located in Madrid, near the Atocha train and metro stations, at the southern end of the so-called Golden Triangle of Art (located along the Paseo del Prado and also comprising the Museo del Prado and the Museo Thyssen-Bornemisza). The museum is mainly dedicated to Spanish art. Highlights of the museum include excellent collections of Spain's two greatest 20th-century masters, Pablo Picasso and Salvador Dalí. Certainly, the most famous masterpiece in the museum is Picasso's painting Guernica. The Reina Sofía collection has works by artists such as Eduardo Chillida, Pablo Gargallo, Julio González, Luis Gordillo, Juan Gris, José Gutiérrez Solana, Joan Miró, Lucio Muñoz, Jorge Oteiza, Pablo Serrano, and Antoni Tàpies. International artists are few in the collection, but there are works by Francis Bacon, Joseph Beuys, Pierre Bonnard, Georges Braque, Alexander Calder, Robert Delaunay, Max Ernst, Lucio Fontana, Damien Hirst, Donald Judd, Vasily Kandinsky, Paul Klee, Yves Klein, Fernand Léger, Jacques Lipchitz, Magritte, Henry Moore, Bruce Nauman, Gabriel Orozco, Nam June Paik, Man Ray, Diego Rivera, Mark Rothko, Julian Schnabel, Richard Serra, Cindy Sherman, Clyfford Still, Yves Tanguy, and Wolf Vostell. Along with its extensive collection, the museum offers a mixture of national and international temporary exhibitions in its many galleries, making it one of the world's largest museums for modern and contemporary art. It also hosts a free-access library specializing in art, with a collection of over 100,000 books, over 3,500 sound recordings, and almost 1,000 videos.