The Ontario County Historical Society operates a free history museum and research library on the same block as the Ontario County Courthouse in Canandaigua. The society's collections document Ontario County's recorded history from the Haudenosaunee occupation through the frontier period, the Erie Canal era, and into the 20th century. The research room holds maps, photographs, newspapers, and genealogical records. The most significant item in the permanent collection is the original three-panel parchment of the 1794 Treaty of Canandaigua, which was signed at the north end of this lake on November 11 of that year. The document is displayed for public viewing annually on November 11 as part of the Haudenosaunee Treaty Day commemoration. The society also maintains a rotating gallery of exhibits. Open Tuesday through Saturday; admission is free.















