Ambani's skyscraper, Mittal's Alps in Forbes' list

India's richest resident Mukesh Ambani's upcoming skyscraper in Mumbai and wealthiest NRI Lakshmi Mittal's getaway in the Alps are among the world's top ten 'Billionaire Playgrounds' for this year, despite the fortunes of the two individuals coming down by more than half.

Others on the list include Russian billionaire Roman Abramovich's 200-acre ranch on Wildcat Ridge in Colorado, Microsoft co-founder Paul Allen's 416-foot megayacht Octopus and Apussuit Adventure Camp, a remote skiing resort in West Greenland frequented by software czar Bill Gates.

The list of the top ten 'billionaire playgrounds', where the world's super-rich go for fun, has been compiled by Forbes Traveler, a luxury travel publication of American business magazine Forbes, known for its lists of richest persons in the world.

"Whether it's seeking out crystal-clear Caribbean waters, retreating to a mountain hideaway or sailing the seven seas in style, the world's billionaires are, in some ways, just like us. They want to relax in privacy and luxury.

"The only difference is, they don't get worried when the bill arrives," Forbes Traveler said in a report on its website.