10 of the Worlds Most Insanely Luxurious Houses- 4.Fleur De Lys, Beverly Hills Mariah Careys palace. The Fleur De Lys is among the worlds most expensive estates with an asking price of $125,000,000 million. Maria Careys new digs were built by a Texan billionaire on 5 acres; it is 41,000 square feet of pure diva luxury and will also be modeled after the most extravagant home of its time: the Palace of Versaille, the former home of Marie Antoinette.