Behind a shack in Northborough

Driving along I saw some rock piles right in the backyard of a broken down shack. After looking around and deciding probably nobody would mind, I parked and went behind to take some quick pictures.
Here are some of the piles:
In these panorama pictures the piles appear to be part of the terracing:
But don't think for a minute that this is "agrarian". Here is the backyard trash shading off into ceremony:
And standing here at this split wedged rock, here is a view of the back of the cabin:
I wonder who lived there?