See inside Kykuit, a 40-room mansion in New York that once belonged to the richest man in the world

See inside Kykuit, a 40-room mansion in New York that once belonged to the richest man in the world

Kykuit Mansion.Talia Lakritz/Business InsiderKykuit, a 40-room mansion in Sleepy Hollow, New York, belonged to the Rockefeller family.It was built in 1913 for John D. Rockefeller, founder of the Standard Oil Company.The property features an art gallery, sprawling gardens, and a collection of vintage cars.At the height of his success, John D. Rockefeller was the world's first billionaire.With a net worth of $1.4 billion in 1937, equivalent to aro…