For years, four cannons (and their 16 cannonballs) sat in Monument Park in Fitchburg. According to this article in the Boston Globe, after lending them out to a reenactment group, the cannons made their way around the state—and country—went missing, were recovered, and went missing again.
At one point, one was found in Northborough during the '60s.
This story follows the trail of these Civil War era cannons, two of which are still missing.
Have you seen a cannon?