Just outside breezewood pa are some cool old x-pressway tunnels that are no longer in use. I stopped there yesterday morning on my way home from washington DC.
I think they bypassed the tunnels about 1967. If you'r ever out that way, you should stop and take a walk, or even better you can rent a bicycle and get a tour from some bicycle shop in town. We spent a couple of hours out there on a nice sunday afternoon, and saw 1 person who was about 1 mile away. I like out of the way non-tourist trap attractions.
you can see the light at the end of the tunnel if you look closely at the first pic