One of the New Hampshire Historical Society's most mysterious and requested artifacts-the "Mystery Stone"-is on long term display at the Society's Museum of New Hampshire History. Open Tuesday-Satuday 9:30-5:00pm. Sunday 12:00-5:00pm and Mondays 9:30-5:00pm from July 1- October 15 and in December. Admission: $5.50 Adults, $4.50 Seniors, $3.00 children 6-18, $17.00 family maximum and free for New Hampshire Historical Society Members. 603-228-6688www.nhhistory.org