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The Pentagoet Archeological District is a National Historic Landmark District located at the southern edge of the Bagaduce Peninsula in Castine, Maine. It is the site of Fort Pentagoet, a 17th-century fortified trading post established by fur traders of French Acadia. From 1635 to 1654 this site was a center of trade with the local Abenaki, and marked the effective western border of Acadia with New England. From 1654 to 1670 the site was under English control, after which it was returned to France by the Treaty of Breda. The fort was destroyed in 1674 by Dutch raiders. The site was designated a National Historic Landmark in 1993. It is now a public park.