March 15–September: 9 a.m.–6 p.m. daily (Grounds 8 a.m.–7 p.m.)
October–March 14: 9 a.m.–4 p.m. daily (Grounds 8 a.m.–5 p.m.)
Open every day of the year, weather permitting, except December 25
10th St. and Constitution Ave., NW Washington, DC
Smithsonian (Mall exit) or Federal Triangle
October 17, 2006 – Permanent
June 12, 2004 – Permanent
October 1, 1998 – Permanent
