Roadside attractions - Old Harvard Rd, Boxborough

Driving south/west off Burroughs Rd, see if you can spot these on the right:Hard to see, and I know there are more piles in this picture than I can see now, but I circled some in red:At first glance this might be a burial site, but I noticed the piles were evenly spaced and somewhat in lines...just sayin'. All visible from that boulder in the background.

Some closeups:Not too exciting but worth surveying more carefully - I think this is another "grid".