9. Fort Western (Maine)
Fort Western, set on the banks of the Kennebec River, played a key supply role during Benedict Arnold’s daring 1775 expedition to Quebec. Built in 1754, its robust wooden palisades supported both military and trading operations in the northern wilds. Remarkably, Fort Western has survived the centuries and stands today as the oldest wooden fort in the United States, offering a rare window into colonial fortification and daily life on the Maine frontier.
