Most people probably won't have heard about Louis Bacon, but he won't mind that. He gets all the perks of being a billionaire without the hassle of people stopping him in the street to take pictures. Bacon is a businessman and entrepreneur who's made most of his money managing hedge funds. As a man with an eye for a good deal, he knew he was onto a winner when he bought Robins Island, just off New York's coast, for $11m in 1993.
The land was subject to a dispute between New York's officials and private companies at the time Bacon bought it, so his stepping in ended a petty dispute over what was then completely undeveloped land. The island is now off limits to the public, but Bacon is known to have taken steps to replenish the over-logged tree population, as well as helped to develop a thriving population of turtles.