Get on the PA Turnpike (I-76) and go east to the Lebanon/Lancaster exit (Exit 20). Take Route 72 north to Lebanon (about 8-10 miles). The road will split at one point and the traffic coming south on Route 72 will be one way. Bear to the right at this point and follow that road (8th street) into the city and take a left on Cumberland Street (the main east/west street in Lebanon) and go west a short distance. The historical society will be on the left side of the street near the light at (I think) 9th street. It has been a while since I went there but Lebanon is my "home" county so I shouldn't be too far off in the directions. Good luck.