Through January 21, 2008, at the National Gallery of Art (4th and Constitution Ave. NW, D.C.). Gallery Hours: Monday through Saturday from 10 a.m. – 5 p.m., and Sunday from 11 a.m. – 6 p.m. Closed on December 25 and January 1. For further information, call 202-737-4215, or see www.nga.gov/hopper.