20. George & Amal Clooney – $20 Million, London
George Clooney and his wife Amal recently moved in their Berkshire mansion with their twins. The cost of building the home was around $20 million, and is probably worth more than that now with a home theater that seats 12, a separate pool house and nanny’s quarters, and an enclosed tennis court, as well as an outdoor playground, and of course a high-end home security system. The Clooneys have made a smart investment in this amazing property.