$15; $12 (ages 5-21, ages 65+ and active military with ID); $10 (Girl Scouts).
Walk-in tours are offered Mon.-Fri. 10:15-4:15, Sat. 12:15-4:15, mid-Jan. through Dec. 30. Tours with advance reservations are given Mon.-Sat. 12:15-4:15, mid-Jan. through Dec. 30; tickets can be purchased up to 6 months in advance. The site may have visiting Girl Scout troops some mornings; phone ahead. Closed Mar. 17, July 4, Thanksgiving, Christmas Eve and Christmas. Phone ahead to confirm schedule.