Looks like Oheka Castle.
Hard to be sure as Oheka went through so many changes over a century.
Oheka was built by a Jewish banker named Otto Kahn.
It's on the North Shore of Long Island, the gold coast, summer home to the Rockerfellers, Gettys, Vanderbilts and other assorted old money blue bloods. It's where The Great Gatsby was based on.
Second largest residential home in the US behind San Simeon.
The story was Otto wanted a summer home amongst his peers but being a Jew and it being the turn of the century no one would sell him property on the water. Best he could do was a mile inland so he trucked in enough dirt to build a hill high enough where he could see the water. His proverbial FU to them.
Cold Spring Harbor Station, part of the Long Island Railroad system exists because he built the tracks to facilitate bringing in workers and building materials.
After Otto passed the property became Eastern Military academy which eventually shut down in IIRC the 70's.
The massive acreage around it was sold off and the structure feel into disrepair becoming a place for local teens to hang out and party. Ask me how I know
It was purchased by a real estate developer who started to restore it with the intent of breaking it up into condo units.
He nearly went bankrupt and sold to a Japanese investor who mostly completed the restoration then sold it back to the developer.
These days it's used as a high end vacation getaway and catering facility.
Stunning structure that can bee seen from miles around.