10) Mago Island, Fiji
Owner: Mel Gibson – Net worth: $600 million
Actor Mel Gibson is best known for his movies Braveheart and Lethal Weapon, and among his assets is the 5400-acre private island which he purchased from a Japanese company in 2005 for a reported $15 million. Not much is known about the island but it is said that Mel Gibson doesn’t intend to change much in the surroundings, and enjoy the natural habit as it is. It doesn’t house many people, except some Fijian caretakers and only has Mel Gibson’s private residence. The interesting fact is that the island is known to be one of the largest private islands in the Pacific.