Gertrude Whitney founded this museum in 1914 because the Metropolitan Museum declined her 500-piece art collection. It is now a well-respected institution with constantly changing (and often controversial) exhibitions of 20th-century and contemporary paintings, sculpture, prints, drawings, photographs, film and video. Every two years, the much-hyped and cutting-edge Biennial exhibition attracts worldwide attention. Museum store and cafe. Open Wednesday and Thursday 11 am-6 pm, Friday 1-9 pm, Saturday and Sunday 11 am-6 pm. US$15 adults, US$10 seniors and students, free for children younger than 12 (pay what you wish Friday 6-9 pm). 945 Madison Ave., at 75th Street (subway line 6 to 77th Street), Manhattan, New York City. Phone 212-570-3600. http://www.whitney.org.