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

12. Silicon Valley Mansion, Los Altos Hills, California ($100M)

Russian billionaire Yuri Milner, who has a net worth of $1B, bought a $100M home in the US. It has both an inside and outside pool and a tennis pavilion. Despite making one of the biggest purchases for a single home in America, this tycoon’s primary residence is still in Moscow with his wife and daughters.