2. Villa Leopolda Cote D’Azur, France $750 Million

Located on the Cote D’Azur, France this palatial estate was built in 1902 and once owned by King Leopold II of Belgium. Bill Gates was also once rumored to have owned it. A Russian billionaire reportedly offered $750 million to buy the property before backing out. It’s currently without an owner. But prospective buyers might like to consider the 19 bedrooms and 14 bathrooms in addition to the formal gardens that are tended to by 50 full-time gardeners.