$5; $4 (New Hampshire residents ages 18-64); $3 (ages 6-17); free (New Hampshire residents ages 6-17 and 65+). Prices may vary; phone ahead.
Fri.-Tues. 10-4, Memorial Day weekend-Labor Day; Sat.-Sun. and holidays 10-4, day after Labor Day-Columbus Day. Last tour departs 45 minutes before closing. Off-season tours available by reservation.