15 most expensive mansions in the world – Queen Elizabeth lives in the most expensive house ever built (With Pics)

4. Kensington Palace Gardens, London, U.K. ($222M)

This luxurious home is owned by Tamara, the daughter of Formula One billionaire Bernie Ecclestone. The amazing features of the house include amenities such as a bowling alley, nightclub and even a bathtub made of Amazonian crystals.