1768707 Castle Gould, Hempstead House, 1904 (litho) by Haydel, Abner J. (20th Century); Free Library of Philadelphia; (add.info.: Hempstead House, or the Gould-Guggenheim Estate, is a large estate located in Sands Point, New York (or more specifically, Sands Point Preserve). The grounds contain two castle-like buildings, Hempstead House, the main house, and a smaller house, known as Castle Gould.); 穢 Free Library of Philadelphia ; American, out of copyright.