15 Most Expensive Private Residences on Planet Earth

Priced $750 million in 2008, the home was built by King Leopold II (one of the many waterfront homes he built) for his concubines. The 20-scre estate had a market price of 500 million Euros during 2008. Though Russian businessman Mikhail Prokhorov sought to buy it in 2008, he had to pull out of the deal and let go for an initial deposit (Euro 50 million).