5. 18-19 Kensington Palace Gardens
Situated in London, this house is owned by Lakshmi Mittal, an Indian steel industrialist. The house consists of 12 bedrooms, Turkish bathrooms, and 20 car parking spaces. During the time of purchase, it was one of the highest purchases in the world. The marbles used in the house were supplied by the same quarry that supplied the Taj Mahal. It was previously owned by Berne Ecclestone, head of the Formula One racing series. It is currently valued at $222 million.