$6; $5.50 (ages 65+ and veterans with ID); $4 (ages 3-11); free (active military with ID and family). Cash only.
Visitor center open Sat.-Sun. 1-4, mid-Mar. to mid-Nov. Guided tours depart on the hour 1-3; other times by appointment. Closed Easter and Mother's Day. Phone ahead to confirm schedule. Allow 1 hour minimum.