NY 9D, Garrison, New York. County/parish: Putnam.
Added to the National Register of Historic Places December 12, 1977. NRIS 77000972.
11 contributing buildings. 1 contributing structure.
Castle Rock, also called Osborn Castle, is the estate of former Illinois Central Railroad president William H. Osborn in Garrison, New York, United States. It sits on the hill of the same name, looking down on the Hudson River 620 feet (190 m) below. Visible from West Point across the river and traffic on NY 9D passing through Garrison, it has become one of the most recognizable man-made landmarks of the Hudson Highlands.
The Osborn family, including paleontologist Henry Fairfield Osborn and his son, conservationist Henry Fairfield Osborn, Jr, owned and lived in it since it was built by J. Morgan Slade in 1881 as a summer residence, although the original acreage has been subdivided considerably since then. In 1977 it was listed on the National Register of Historic Places. Castle Rock was bought in 2021 by George Carroll Whipple III, a third generation Putnam county resident and philanthropist.
(read more...)National Park Service documentation: https://catalog.archives.gov/id/75321024