Visitor center free. Guided tour $6; $5 (ages 62+ and active and retired military with ID); $4 (ages 3-12).
Tours are given Mon.-Sat. 9:30-5, Sun. noon-5, Memorial Day-Labor Day (weather permitting). Schedule varies rest of year and is weather dependent; phone ahead to confirm schedule. Last tour begins 30 minutes before closing. Closed Jan. 1, Easter, Thanksgiving, Christmas Eve, Christmas and Dec. 31. Allow 30 minutes minimum.