If you're in the area, don't miss this gem. Yes, it's a $5 admission (adults) but that gave us a great escorted tour of the Old Jail, Civil War history, and the Underground Railroad, and the Confederates torching the town inn 1864. Fascinating to read the letter a Yankee wrote; the false fireplace used to hide fleeing slaves; the Indian artifacts from the area; the jail itself (3 floors) and the gallows in the "exercise yard". Chambersburg is a small town and this is a gem. Certainly, if you're used to great museums and restored towns, etc. you'll ridicule this endeavor. But, we found it well worth the $5 and glad we didn't miss it.
You can be in-and-out in 30 minutes or less but we spent almost 2 hours there. If you're looking for genealogy, they have an entire area devoted to that. Plan on climbing narrow stairs (no elevators) and being constantly reminded to "watch your head".