I say through, because we go through 4 sets of these tunnels. Hubby said that there used to be 8 of them!
I love the PA hills. The camera doesn't do them justice!
2nd tunnel, the Tuscardor,
The inside of the tunnel, with lots of lights. I don't like being underground. I asked hubby how long these tunnels will last before they collapse. That gives me goosebumps!
4th tunnel, Blue Mountain,