I was backtracking a readers search terms and came across this:
Just after the large pavilion, you will see on the right, but set in way, the Smallpox Burial Ground. According to a placard at the site, in the 1700s the towns of Framingham and Sudbury buried their dead from a smallpox epidemic "as far away from town centre as possible." The infected were quarantined in a nearby "pest house." The cellar hole for the house is still there. Those who died in the epidemic were buried with no grave markers, although there are creepy human-shaped piles of stones marking the graves.