'Matinecock Farm' was built circa 1678 by John Underhill Jr. in Lattingtown. John William Mackay III, the son of Clarence Mackay of 'Harbor Hill', purchased the house in 1957. The house was unfortunately demolished in 2005, but stood HERE, seen on google earth.
'Hawirt' was built c. 1904 for William Richmond Peters by the architect Erick Kensett Rossiter in Mill Neck. Peters was founder and president of Peters, White & Co. which imported chemicals as well as a founder of Columbia Trust Company. The house still stands and is located on West Shore Road in Mill Neck.
'Burrwood', the Walter Jennings estate in Lloyd Harbor designed by Carrere & Hastings. Click HERE to see what remains of 'Burrwood'. 
Photos from the Library of Congress.
Mrs. Harold Irving Pratt in her tulip garden at their estate 'Welwyn' in Glen Cove.
A wall and gate entrance along Dosoris Lane that leads to the side of John T. Pratt's 'Manor House' in Glen Cove (the top of which can be seen just beyond).
A statue at the end of the 'Azalea Walk' at William R. Coe's 'Planting Fields' in Oyster Bay.
What remains of the reflecting pool that was at the end of the formal gardens to 'Meudon', the William D. Guthrie estate in Lattingtown. Click HERE to see the ruins on google earth.
The James O'Connor designed sunken indoor tennis court to William R. Grace Jr.'s 'Crossroads' estate in Old Westbury.
'Next Door', the home of W.R. Grace Jr.'s youngest daughter Patricia and her husband Alan Corey Jr. and their family, seen in winter.
Above is all that is left of the 'Pratt Oval', the administration and service buildings to the massive tract of land owned by the Pratt family in Glen Cove. The clock-tower can be seen below in the center of the picture. Everything else (besides a piece of one other building) has since been demolished and a housing development has taken its place. The large house visible to the right is 'Killenworth'. Click HERE to see the clock-tower on google earth.
The block plan showing the surroundings of George Dupont Pratt's 'Killenworth' estate in Glen Cove, by Trowbridge & Ackerman.
The second half of the September 4th, 1947 photo set of Frank Woolworth's 'Winfield Hall' in Glen Cove (taken when Richard Reynolds owned the estate). Once again a very big thanks to StuccoHouse for sharing these photos with us! 
The following photos of Frank W. Woolworth's 'Winfield Hall' in Glen Cove come from a great blog/blogger, StuccoHouse, whose uncle worked personally for Richard Reynolds and for the Reynolds Company. The photos were taken on September 4th, 1947, at which time the Reynolds family occupied the estate. I really cannot thank StuccoHouse enough for sharing these photos, not only are they incredibly unique but they offer a glimpse into what 'Winfield Hall' looked like in 1947. Thanks StuccoHouse! 
Stay tuned for Part 2 tomorrow.
The stables, paddocks and the rear of the dog kennel at Henry Carnegie Phipps' 'Spring Hill' in Old Westbury.
The Roslyn Duck Pond makes up roughly the center of the old town of Roslyn. Consisting of 3 ponds full of water fowl, the area has been popular for the last 300 years. Most of the houses in the distance date to before 1875, some to before 1800. Click HERE to see the Roslyn Duck Pond on google earth.
You can always find ducks here, no matter the time of day or year. 
