No one sleeps at Antilia, a $1-billion residence built for India's richest man, because it violates the tenets of Vastu Shastra, an ancient version of feng shui.

The ballroom is one of many spaces used by the family during the day. The 27-story "house" has 168 parking spaces, nine elevators, three helipads, a health spa, a 50-seat theater and more.