Witanhurst - London, United Kingdom: This historic mansion is valued at around $450 million and is located in the exclusive Highgate neighborhood of London.
Villa Firenze - Beverly Hills, United States: This property is valued at around $165 million and features a 20,000-square-foot main house, a guest house, and a pool house.
Ellison Estate - Woodside, United States: This sprawling estate is owned by Larry Ellison, the co-founder of Oracle Corporation, and is valued at around $200 million.
Buckingham Palace - London, United Kingdom: Buckingham Palace is the official residence of the British monarch and is estimated to be worth around $5 billion.
Known as The One Bel Air, the property comes from film producer-turned-real estate developer Nile Niami, who initially hoped to sell it for a whopping $500 million but couldn't.
Villa Les Cèdres - French Riviera, France: This historic villa, which was built in 1830, is valued at around $410 million and is located in the exclusive town of Saint-Jean-Cap-Ferrat.
Antilia - Mumbai, India: This 27-story skyscraper is the world's most expensive house with a value of around $2 billion.
World's Most expensive Houses and their value | List of world's most expensive houses and its cost.