Works by Braque , Chagall , Giacometti , Picasso , and many other 20th-century artists hang next door in the Museo de Arte del Siglo XX ( Museum of 20th-Century Art ) .
Paintings by Braque , Chagall , Giacometti , Picasso are in the Museum of 20th-Century Art . The can be seen between the hours of 9 and 6 .