5) Abrahamovich island in St. Barts
Owner: Roman Abrahamovich – Net worth: $13.4 billion
Roman Abrahamovich is a Russian billionaire known for his investments in multiple ventures through his investment firm Millhouse LLC. His list of exotic assets includes this private island, which earlier belonged to Jeet Singh, the cofounder of ATG. Even though close to half his wealth has been worn off during the recession, it did not prevent him from purchasing this $90 million property, making it one of the most expensive ever sold. Amenities include oceanic views, tennis courts and swimming pools on this 70 acre island.