McClurg Museum in Westfield, New York, occupies an early nineteenth-century mansion built in 1818 by James McClurg and long known locally as “McClurg’s Folly” for its unusual size and refinement. The house later became the residence of William H. Seward from 1836 to 1838 during a tense period of land disputes tied to the Chautauqua Land Company. Since 1951 it has served as the headquarters of the Chautauqua County Historical Society, founded in 1883, which restored and furnished the building in period style. Its significance rests not only in the mansion itself but also in its extensive library, photographs, manuscripts, artifacts, and genealogical resources.