Real Estate 25 Biggest Mansions In The World June 26, 2017 11:37 am | Comments: 0 | Views: 58487 Indian Neck Hall (Oakdale, New York) When this Georgian style home was built in 1897, it was said to be the biggest mansion on Long Island at 75,000 square feet. ◄ Back Next► 1 / 25 Sources: List25 Previous Article Next Article Write a Reply or Comment Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Save my name, email, and website in this browser for the next time I comment. Current ye@r * Leave this field empty Notify me of follow-up comments by email. Notify me of new posts by email.