Antilia, Mumbai, India
Owner: Mukesh Ambani, worth $21.5billion
Value: upward of $1 billion
The twenty-seven story, 400,000-square foot skyscraper residence, named after a mythical island in the Atlantic, has six underground levels of parking, three helicopter pads, a health level, and reportedly requires about 600 staff to run it. It is the worlds most expensive home far and away with construction costs topping $1 billion.
Villa Leopolda Villefranche-FRANCE
Owner: Lily Safra, worth $1.2 billion
Price: 500 million euro ($750 million at the time) in 2008
King Leopold II reportedly built a series of waterside homes for his many mistresses. This 20-acre estate was valued at 500 million euros in 2008, when Russian billionaire Mikhail Prokhorov attempted to buy it. He eventually pulled out of the deal, forfeiting a 50 million euro deposit.
Fairfield -Sagaponack, New York
Owner: Ira Rennert, worth $6.5 billion
Property value: about $248 million, according to 2012 tax assessments
The industrial billionaires hulking 29-bedroom, 39-bath Hamptons compound has not one, but three swimming pools, plus its own power plant on premises.
Kensington Palace Gardens, London, U.K.
Owner: Lakshmi Mittal, worth $16.5 billion
Purchase Price: 117 million pounds ($222 million at the time) in 2008
The steel magnate is believed to own three homes on the high-security street known as Billionaires Row, including a neo-Georgian mansion near the Israeli embassy. The home (not pictured), rumored to have been purchased for Mittals son, was sold by hedge fund billionaire Noam Gottesman.
One Hyde Park, London, U.K.
Owner: Rinat Akhmetov, worth $15.4 billion
Sale Price: $221 million in 2011
The worlds most expensive apartment, located in posh Knightsbridge, was purchased by the Ukraines richest man. It boasts a staggering 25,000-square feet, bullet proof glass and 24-hour hotel concierge service.
Ellison Estate, Woodside, Calif.
Owner: Larry Ellison, worth $43 billion
Value: estimated $200 million to construct
The Oracle founder, arguably the worlds most avid collector of real estate, built his 23-acre Japanese-style estate in 2004 with 10 buildings, a man made lake, a tea house, a bath house and a koi pond. The property is currently assessed at just over $70 million.