The artworks of many epochs and regions are on display, but the museum is most noted for its collections of French Impressionists and American realists of the late 19th and early 20th centuries. It's a satisfying collection for connoisseurs, and won't test the patience of reluctant museum-goers. Take the elevator to the fourth floor and work down. The top floor is utilized primarily for special exhibitions. On the third floor are 14th- to 18th-century Gothic ecclesiastical panels and 16th-century Italian and Dutch portraits, among them paintings by Rubens and Hals. In sharp contrast are adjoining galleries of 20th-century works -- Rothko and Rauschenberg as well as Picasso and Mondrian. The second floor is commanded by compelling African and Asian artworks.