'Bastion of the super-rich': inside a New York billionaire's private museum

A collection of art, featuring pieces by Picasso, Lichtenstein and Cézanne, has been kept secret for years but for select members of the public, the door is slowly being opened It was Fleet Week in New York City, and something unusual was taking place on Billionaires' Row. At 9 West 57th Street, an elegant black sloping skyscraper towering over the Plaza hotel and the half-dozen sailors congregated outside, 20 people were ushered into a small, glass-fronted gallery on the ground floor. A feroci...