1. Matinecock Point
The 140 acre Georgian style J.P. Morgan Jr. estate, Matinecock Point, was constructed in 1913, designed by Christopher Grant LaFarge. This was the estate of financier J.P. Morgan’s son J.P. Morgan Jr. The estate was difficult to access at it was only accessible through a guarded bridge. Morgan was actually shot twice by an intruder in 1915 but survived the attack.
After the family sold the residence when J.P. Morgan died in 1943, it eventually became a religious institution for the Sisters of St. John the Baptist. The mansion was demolished in 1980, with its dairy complex and a cottage remaining as private residences. The ghost of Alice Morgan, youngest daughter of J.P. Morgan Jr. who died young of typhoid fever, was believed to have haunt the estate.
For Long Island mansions you can visit, check out 10 Historic Mansions to Visit on Long Island from the Gold Coast Era and for more abandoned New York, read 12 Abandoned Places to Discover in Brooklyn, NYC.