I looked it up on Wikipedia. There is a whole history about it. I was hoping to get some inside pictures. I just c&p this little blurb because I couldn't believe it. As far as I got (I didn't read the whole thing) Cecil is a direct descent of Vanderbilt, who had it built as his little summer retreat. I'd love to go through it, but alas! I just don't travel well any more.

Since the death of William A. V. Cecil in October 2017 and his wife Mimi Cecil in November, their daughter Dini Pickering has served as board chair and their son Bill Cecil as chief executive officer. The house is assessed at $157.2 million, although due to an agricultural deferment, county property taxes are paid on only $79.1 million