Oooooh! good one!
http://www.damnedct.com/gungywamp-groton
http://www.damnedct.com/wordpress/wp-content/uploads/2008/12/gwamp4.jpg
Or, as the old saying goes, colonial root cellar my ass.
It isn’t a root cellar. I think it was made by someone (Irish or Welsh) before Columbus. The Newport Tower is another mystery. I think it was Vikings.