Antilia, Mumbai

Mukesh Ambani's Antilia in Mumbai is a 27-storey, 400,000 square foot private residence estimated to be worth $1 to $2 billion — making it the world's most expensive home. Designed by Perkins+Will and Hirsch Bedner Associates, it requires a staff of 600, includes six underground floors of parking for 168 cars, three helipads, nine elevators, and a dedicated snow room that produces artificial snow year-round in Mumbai's tropical climate.