4. The Knickerbocker Club (1871)
The Knickerbocker Club, located on East 62nd Street, was founded in protest against what were seen as the declining standards of The Union Club. J.P. Morgan was a member until he resigned in protest because his friends weren’t admitted, and started the Metropolitan Club. It remains one of the most elusive of clubs, though often mentioned in popular culture, and continues to lack a website. It also remains male only.