1. Antillia — $1 billion

Owned by Indian billionaire industrialist Mukesh Ambani, Antillia is more than a house. This estate will completely blow your mind. It features 27 stories and 400,000 square feet. This south-Mumbai compound also boasts six underground parking levels, three helipads and a staff of 600 people. How can Ambani afford such a place? He’s the proud owner of Reliance, an oil and gas firm and the second-biggest company in India.