A couple of weeks ago I posted that DH wanted to go to the outerbanks, but after talking to his aunt on the phone tonight he's decided he wants drive to IN to go visit his 90 yo Grandmother. 

The drive
takes about 19 hours and generally we take about two days to get there but in order to make this a more enjoyable trip for the kids I've proposed that we drive out at a slower pace stopping along the way to visit one or two sites, visit with his grandmother then turn around and head home again stopping at a couple of sites along the way. Having endured the pleasure of our very bored and whiny children 
when going to IN before, DH thought this was a good idea as long as we could come up with some places to stop.
We've already visited the Statue of Liberty and the Neil Armstrong Museum so those are out. Off the top of my head I suggested the Rock N Roll hall of fame in Cleveland, which DH thought was a good idea, but I have no other ideas and DH had no ideas at all.
Can anyone make suggestions of places to visit along the way? I'm looking for places that will take about 1/2 day or a little more to visit and that are within a 1/2 hour or so drive of a major highway, but that won't take all day so we can get some driving in. We can drive out and return via a variety of routes. We live in southeastern MA and they live in central IN on the Ohio Border so places in NY, PA, NJ, OH, WV.
TIA


The drive



We've already visited the Statue of Liberty and the Neil Armstrong Museum so those are out. Off the top of my head I suggested the Rock N Roll hall of fame in Cleveland, which DH thought was a good idea, but I have no other ideas and DH had no ideas at all.
Can anyone make suggestions of places to visit along the way? I'm looking for places that will take about 1/2 day or a little more to visit and that are within a 1/2 hour or so drive of a major highway, but that won't take all day so we can get some driving in. We can drive out and return via a variety of routes. We live in southeastern MA and they live in central IN on the Ohio Border so places in NY, PA, NJ, OH, WV.
TIA