There’s an odd-looking building in South Mumbai in India that looks like it’s under construction, only that it’s finished and furnished. And by how much. Called the Antilia, after mythical island in the Atlantic, the building is famous not for its odd structures of extra high ceilings and protruding floors; it’s the second most expensive house today at $1 billion. Barring the Buckingham Palace, which is valued at $1.55 billion, it would have been our most expensive house in our list, as Forbes.com has named it in 2014.