Fort Hill is the burial place of John Townsend, who died in 1668; Robert Townsend, “Culper, Jr.” (1753–1838) of General Washington’s intelligence service; and his sister Sally Townsend (1761–1842), both of whom were instrumental in disclosing the Benedict Arnold–John André plot to surrender West Point to the British in 1780. The cemetery is owned by the Town of Oyster Bay.