Fort Kent State Historic Site is a Maine state park in the town of Fort Kent, Maine. Located at the confluence of the Fish and Saint John Rivers, it includes Fort Kent, the only surviving American fortification built during border tensions with neighboring New Brunswick known as the Aroostook War. The park features an original log blockhouse, which is open for visits in the summer. The fort was added to the National Register of Historic Places in 1969 and declared a National Historic Landmark in 1973.