Penthouse D, One Hyde Park, London

Cost: $237 Million

This penthouse is the most expensive apartment in the most expensive residential building ever built. Costing $2 billion, One Hyde Park is located right in the heart of London, making it one of the most attractive pieces of property in the world.

While a quarter of a billion dollars might sound like an impossible sum of money, that was the sale price of this penthouse to an unnamed Eastern European billionaire. Amazingly, the penthouse didn’t even come with furnishings, flooring, or even internal walls. Still, the prime location made this property worth the money, at least to one incredibly wealthy buyer.