#7 Villa Leopolda, Villefranche-sur-mer, France
This view is as glorious as the Villa itself. King Leopold II was very generous with his multitude of mistresses. Between 1929 and 1931, he purportedly built several waterside homes for them on a sprawling 20-acre estate in the French Riviera. Brazilian philanthropist Lily Safra, whose net worth is around $1.2 billion, purchased the home, rumored to be the second most expensive home in the world, for $750 million in 2008.