Lyndhurst, also known as the Jay Gould estate, is a Gothic Revival country house that sits in its own 67-acre (27 ha) park beside the Hudson River in Tarrytown, New York, about a half mile south of the Tappan Zee Bridge on US 9.

[3][4] The home was designed in 1838 by Alexander Jackson Davis, and owned in succession by New York City mayor William Paulding Jr., merchant George Merritt, and railroad tycoon Jay Gould.

Davis' new north wing included an imposing four-story tower, a new porte-cochere (the old one was reworked as a glass-walled vestibule), a new dining room, two bedrooms and servants' quarters.

The house sits within a landscape park, designed in the English naturalistic style by Ferdinand Mangold, whom Merritt hired.

The park is an outstanding example of 19th-century landscape design with a curving entrance drive that reveals "surprise" views of rolling lawns accented with shrubs and specimen trees.