The Fort Kent blockhouse is located at the confluence of the Fish River and the St. John River in Fort Kent, Maine. This state-owned structure is the only extant fortification relating to the "Bloodless" Aroostook War of 1838ñ39, and the border dispute between Great Britain and the United States. The signing of the Webster-Ashburton Treaty in 1842 settled the boundary dispute between Maine and New Brunswick and reduced the need for a fort, although federal troops remained there until 1845 to protect Maineís and the United Statesí interests in the region. In addition to being listed in the National Register of Historic Places, the structure is a National Historic Landmark.

The blockhouse is a two-story structure. Its walls are built of square-hewn cedar logs, some of which measure over 19 inches in width. Although a few minor changes have been made to the structure, including some related to its present use as a museum, it remains a good example of early-19th-century military architecture. Care and public presentation of this site is currently provided by local Eagle Scouts, in cooperation with the Bureau of Parks and Recreation, Maine Department of Conservation.