This looked like a good prospect for exploration, except that Northborough (or Northboro) is in the category of "usually disappoints". This was no exception: the part of the hill I explored had very little to see in the way of rock piles. There was one remnant pile, with a nice prospect to the west:And there actually was a bit of a site in a saddle north of the main summit. The path goes right through these, almost invisible, piles (there are 3 or 4 in the picture):
I guess I should not call this a disappointment. In any case I did not explore down around the wetlands or on all parts of the hill - so it might be worth a second look.