#5 One Hyde Park, London (British) / 196,619,217 $ / bulletproof glass, 24-hour armed guards
#4 Fair Field, Sagaponack, N.Y. (British) / 154,537,366 $ / millions of millionaires famous for 'Billionaires's Row'
#3 Fair Field, Sagaponack, N.Y. (U.S.) / 220,640,569 $ / 29 bedrooms, 39 bathrooms, 3 private pools, even private power plants
#2 Villa Leopolda, Villefranche-sur-mer (France) / 444,839,857.65 $ / The total land area is about 25,000 pyeong.
#1 Antilia, Mumbai (India) / 889,679,715 $ / Named after Atlantis in Atlantic Ocean that existed in myth