A stone bridge at Knox Headquarters in the Ellison estate's surrounding woods.
A stone bridge at Knox Headquarters in the Ellison estate's surrounding woods. EricAOrtner · CC BY-SA 4.0

Knox Headquarters State Historic Site

State Historic Site · New York · New York State Office of Parks, Recreation and Historic Preservation

National Historic Landmark/National Register (90NR02311)

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New York State Office of Parks, Recreation and Historic Preservation

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219 parks mapped in New York

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Sources: Wikimedia Commons / editorial, State agency, USGS PAD-US · updated 2026-08-23