Visitor center free. Atheneum tour (includes orientation film and Atheneum exhibit) $18; $15 (ages 60+ and military with ID); $5 (ages 0-7); $30 (family).
Visitor center daily 9:30-5, mid-Mar. to Dec. 30. Guided walking tours are Sat.-Sun. at 10. Bus tours and self-guiding cellphone tours also are available. Closed Jan. 1, Easter, Thanksgiving, Christmas Eve, Christmas and Dec. 31. Allow 30 minutes minimum.