She's Got a Ticket To Ride

I found a $71 combo T-pass on the ground this morning. I looked but didn't see anyone frantically searching their person for it. I would have turned it in to the MBTA if the owner had signed the back, but without a signature, the MBTA will not return it to anyone (I learned this first-hand a few years back). So, having no way to trace the owner, I kept it.

I already have a subway pass, but now I have free access to the commuter rail for the rest of the month. I never really ride the commuter rail, but since I have this, I might as well use it.

What are some interesting things worth visiting on the commuter rail?