Kahn was a huge collector of art. His arts patronage included establishing prizes for New York’s black artists and donating money and paintings to various civic museums. He also wrote many books on art, history, politics, and business, including Of Many Things (1926), a collection of his speeches and writings on finance and politics.

This is a bird's-eye view of OHEKA in 1915, so a little before its completion. It shows its expanse and Kahn made the most of every inch of space, even installing his own private airstrip. In its heyday, the 127-room castle had more than 100 staff members who used a network of secret passageways and tunnels to keep out of sight.

Tour the stunning 100-year-old mansion that inspired The Great Gatsby