The dairyman's cottage to Clarence Mackay's 'Harbor Hill' estate in Roslyn. The dairyman's cottage was designed by Warren & Wetmore, as were the stables, dog kennels and polo pony stables. Only the cottage remains. Click HERE to see the dairyman's cottage on google earth, the development behind the cottage used to be a very large open field.
The Enlisted Men's Club at Mitchel Field, or Mitchel Air Force Base in Garden City. Mitchel Field was home to a number of Air Force units including a number of fighter groups, and was in use from 1918 to 1961. After the Air Force turned over possession of the property to Nassau County the land was redeveloped and today hosts a number of things including the Long Island Children's Museum and the Cradle of Aviation Museum.
'Seamoor' was built for Charles Millard Pratt c. 1890 by Lamb and Rich. C.M. Pratt was the eldest son of Charles Pratt, and was secretary, director and treasurer of Standard Oil Co., as well as the head of the syndicate that ran the LIRR and was the president of the board of the Pratt Institute. His estate, the first of the Pratt homes to be built in the Dosoris section, was named partially after his wife Mary Seymour Morris and was at one point close to 150 acres. The house is no longer standing.
Built for Winthrop Williams Aldrich c. 1926, possibly by William Truman Aldrich, in Brookville. Aldrich was president and chairman of the board of Chase National Bank and U.S. Ambassador to Great Britain for 5 years in the 1950's. The estate sat on over 100 acres and was eventually sold to Alfred Gwynne Vanderbilt II who owned the house for half a decade. The property has since been subdivided. Click HERE to see 'Broadhollow' on google earth.
Click below to see 'Broadhollow' intact in a 1966 aerial shot."In the United States the era of the great house lasted a mere half-century, from 1880 to 1930. In these 50 years, a tradition barely developed, and there has been pitifully little research done by scholars to document it. Until very recently, only a small group of devoted adherents believed the subject worthy of serious research at all. Many in the academic community dismissed these structures as grandiose architectural aberrations created by parvenu families such as the Vanderbilts and the Astors. When English historian Clive Aslet began doing research for his 1990 book, The American Country House, he was told by friends and associates on both sides of the Atlantic Ocean that the subject was certainly not broad enough for an entire publication. Fortunately, Aslet ignored their inaccurate if well-intentioned advice, thereby documenting a multitude of structures that might otherwise have been consigned to undeserved obscurity."Indeed.
Buried in the woods on Henry Carnegie Phipps' 'Spring Hill' in Old Westbury is this former pond, which was fed by a grotto and accessed by horse paths. 
The garden wall at Henry Carnegie Phipps' 'Spring Hill' in Old Westbury pictured at the end of winter.
What appears to be some sort of garden chair at Benjamin Moore's 'Chelsea' in Muttontown.
Walter Jennings, vice-president, director and secretary of Standard Oil Co. had Carrere & Hastings design him an enormous home in Lloyd Harbor c. 1899. He also had the Olmsted Brothers design extensive landscaping for the property between 1915 and 1938. Click HERE to see what 'Burrwood' looked like.
A garden wall and stairs that faced the house, with a large urn visible in the distance.
The view from the top of the gardens, some ironwork is visible between the weeds.
A massive copper beach that sits at one end of the gardens.
The tea house.
One of the higher points on the property, this area has a low wall around the perimeter and an outcropping in the distance.
Beneath the balustrades sits a reflecting pool. When this was in working order you could have walked around either side and down a level.
The view from just beneath the southern terrace which is original to the house. The home had an incredible view over Cold Spring Harbor and out towards the Long Island Sound. 
When Foxhall P. Keene's 'Rosemary Hall' in Old Westbury was pictured HERE last summer the house was still awaiting the four Corinthian columns that support the portico to be reinstalled. The renovation seems complete as the columns have been put up and the house once again looks as it did 100 years ago.
Along the side of Muttontown Road in Muttontown is this small cemetery that dates to before the Civil War. Most of the names on the headstones have weathered away making it rather hard to know who any of these people were, but they all seem to have died in the first half of the 19th century. Click HERE to see the cemetery on google earth.
George Weekes, born 1762, died 1850, age 88.
Benjamin Moore's 'Chelsea' as seen from across the Ferrucio Vitale designed pond in Muttontown.
There used to be formal gardens next to the house, designed by Innocenti & Webel. Today they are completely overgrown and falling apart.
The pet cemetery.
At the far end of the garden is this gazebo, which sits in the middle of a half moon of trees (which are hardly visible today).
The ruined greenhouse.
For anyone who watched NBC's 'Kings' last night, you probably noticed a whole lot of Daniel Guggenheim's 'Hempstead House' in the show. The entrance to King Silas' home was the Apthorp apartment building in NYC. The interiors (where they threw the banquet and played the piano) were the interiors of 'Hempstead House'. They used the exterior of 'Hempstead House' as a different residence, one they said was at 'the vineyard'. So they were able to get quite a bit of use out of the home, which I imagine will be seen in a bunch of upcoming episodes.
'Overland House' was built for George Rose by the firm of Hoppin & Koen c. 1910 in Old Westbury. The house sat on over 50 acres and was unfortunately demolished in 1950.
The Wardenclyffe Tower (or Tesla Tower) was built for Nikola Tesla in Shoreham c. 1902 by Stanford White (who designed the main building). Tesla was trying to build a wireless electricity and communications tower and the core of the structure was never fully completed. By 1907 the place was more or less shut down as Tesla had run out of financing. Click HERE to see where the Tesla Tower stood on google earth.
An aerial view of William Collins Whitney's 'The Manse' by McKim, Mead & White in Old Westbury. This view gives you an idea of how immense this house was. Click HERE for more on 'The Manse'.
