2. Villa Leopolda, Villefranche-sur-Mer, France
Villa Leopolda is a massive villa in Villefranche-sur-Mer, France. It was built in 1931 by an American architect, and it was once owned by King Leopold of Belgium. King of Belgium made many waterside mansions for his mistresses and this is one amongst them. This historic building was utilized as the military hospital during World War I.
Presently it is owned by a Brazilian philanthropist and socialist, Lily Safra. Her husband Edmond Safra, a banker, purchased it in 1988. Safra also hired two renowned designers to renovate the house. The cost of the home was $750 million in 2008, when an unsuccessful attempt was made by billionaire, Mikhail Prokhorov, to purchase it. This exorbitant 20-acre home is on the list of world’s most expensive houses.