Also in Pennsylvania was Gettysburg. I had not been before and had no concept of what a huge space that battle area encompassed. I thought it would be one big field, when in fact the fighting happened all over the entire town area. A 24-mile driving tour is set-up for those who want to see it all.
While staying at our friend's in Leesburg, VA, we got to take a day trip to Harpers Ferry -- another place made famous by John Brown's famous raid prior to the Civil War. Today, it's a beautiful spot where you can stand in West Virginia and see both Maryland and Virginia across the way.
Another point of interest at Harpers Ferry is the headquarters/conservancy for the Appalachian Trail something Jason was pretty excited to get to visit.