Fort Beausejour was built by the French in 1751 to control the Isthmus of Chignecto, the narrow land bridge between present-day New Brunswick and Nova Scotia. The British captured it in 1755, renamed it Fort Cumberland, and soon after used it during the deportation of Acadians from the region.
The earthworks are the main thing to see. From the ramparts the marshes spread out in every direction, making it easy to understand why this small ridge mattered so much. The visitor centre gives the military and Acadian context without turning the place into a long museum slog.