$10; $5 (ages 3-11 and 60+); free (ages 0-2 and active military with ID). Cash only.
Bus tours depart daily on the hour and half-hour 10-2, mid-May to mid-Sept.; on the hour 11-2, late Mar. to mid-May and mid-Sept. through Oct. 31; Tues.-Sun. at 1:30, rest of year. Phone ahead to confirm schedule.