April usually brings a shower of exhibit openings in the United States and abroad, and this year is no exception. Some notable shows:

- Memphis, Tenn.: "Ancestors of the Incas: The Lost Civilizations of Peru," at the Memphis Pyramid, is billed as the largest exhibit of Peruvian artifacts ever to travel to the United States. It includes three mummies never seen outside Peru and more than 300 artifacts spanning 3,000 years. Thursday to Sept. 16. Information: 1-800-263-6744.- Washington, D.C.: "Degas at the Races," at the National Gallery of Art, is devoted to the French Impressionist's fascination with horses. It includes more than 120 paintings, pastels, drawings and sculpted figures. Through July 12. Information: 1-202-737-4215.

- London: "The Power of the Poster," at the Victoria and Albert Museum, covers 120 years of posters by Toulouse-Lautrec, Aubrey Beardsley, Saatchi & Saatchi and others drawn from the museum's 10,000-piece collection - its largest such exhibit in six decades. Through July 26. Information: 011-44-171-938-8349.

- New York: Three galleries devoted to Edward Hopper, Georgia O'Keeffe and Alexander Caldwell are among eight newly opened in a major expansion of the Whitney Museum of American Art. More than 100 works from the museum's permanent collection are displayed. Information: 1-212-570-3676.

"Paul Robeson: Bearer of a Culture," at the New-York Historical Society, explores the life of the African American artist and activist 100 years after his birth. Through July 12. Information: 1-212-873-3400.

Royal Apartments

ROYAL APARTMENTS TO RE-OPEN IN LONDON: The Kensington Palace State Apartments in London, which include paintings and furniture from the royal collection, are scheduled to reopen May 1 after being closed since September 1997 for renovation. Also starting May 1, the royal ceremonial dress collection, which includes the 1893 wedding dress of Queen Mary and several dresses of Queen Elizabeth II, will be displayed in the palace. Palace admission is about $13 for adults; lower rates for children and seniors. Information: 1-800-806-7187.