Rhinebeck
Wyndcliffe is an abandoned mansion in the town of Rhinebeck, New York. The scale of this place is absolutely enormous, and its style seems different from any of the other Hudson River estates. It inspired the phrase "keeping up with the Joneses" and is featured on the cover of a book on American ruins.
9 of the Most Fascinating Abandoned Mansions from Around the World
Bannerman Castle, Bannerman Island, New York. A Scottish immigrant, Francis Bannerman purchased the island in 1900 and built a castle to advertise his military surplus business. Two years after Bannerman's death in 1918, 200 tons of ammunition shells and powder exploded, destroying a small part of the structure. Then in 1969, a fire destroyed the floors and roofs as well. The island is vacant, uninhabited since 1950, after the only ferryboat that serviced the island sank in a storm.