Although this prince being the favorite son of King Fahd has many palaces all over Saudi Arabia this palace looks most futuristic and elegant. Area: 85 acres! which is 0.343 sq km!
Palaces, Homes - Celebrity - Government
It was constructed by Saudi Oger which is owned by the Hariri family. Like most of his palaces this one has a large berth, a beautiful spring, elegant tents and splendid garden along with helipads and boats. Costs in excess of US $740 million.