Crispus Attucks is generally accepted as the first martyr of the American Revolution, being the first person shot to death at the Boston Massacre in 1770. But Crispus Attucks was not from Boston, he was from Framingham.
He was born in 1723 to an African father and Native American mother and worked as a slave until escaping in 1750. Not much is known about him in the twenty years leading up to his role in the Boston Massacre.
Up until 1750 he lived and worked near the bridge that was dedicated to his memory and is the subject of this cache. The cache itself should be an easy find while viewing the rushing brook that once supported a mill.

Death of Crispus Attucks at the Boston Massacre by James Wells Champney, (American artist, 1843-1908)