There was more than one mansion on Long Island's Gold Coast that influenced the writing of The Great Gatsby by F. Scott Fitgerald. The neighborhood was the playground of the elite wealthy during the early 20th century. The most opulent was Harbor Hill, owned by Clarence Mackay and his wife Kitty. Mackay's story is one we've all heard before, even if the names change. Industrial tycoons of the Gilded Age passed their wealth down to descendants who only wanted to party the Roaring '20s away, until the crash of 1929 ruined everything. Let's take a look at the amazing display of conspicuous consumption that Harbor Hill was to Clarence Mckay, and ultimately to F. Scott Fitzgerald.