1. Antilia, Mumbai, India
Owner: Mukesh Ambani, net worth $23.9 billion
Value: upward of $1 billion
The 27 story, 400,000-square foot skyscraper residence, named after a mythical island in the Atlantic, has six underground levels of parking, three helicopter pads, a ‘health’ level, and reportedly requires about 600 staff members to run it. It is the world’s most expensive home far and away with construction costs topping $1 billion.