11. Fort Halifax (Maine)
Fort Halifax, with its distinctive double-palisaded design, stood guard over the Kennebec River during the mid-1700s. Built to deter French and Native attacks, it served as a key defensive post during a period of intense frontier conflict. Though smaller than other regional bastions, Fort Halifax’s sturdy blockhouse—one of the oldest in the U.S.—remains a testament to colonial perseverance and the challenges of Maine’s unsettled borderlands.
