Antilia

Antilia, a 27-story skyscraper-mansion in Mumbai owned by Asia's richest billionaire Mukesh Ambani, stands over 37,000 square meters (400,000 sq ft) and includes amenities such as three helipads, air traffic control, a 168-car garage, a ballroom, 9 high-speed elevators, a 50-seat theater, terrace gardens, swimming pool, spa, health center, a temple, and a snow room that spit

Antilia's architectural design is inspired by the lotus and the sun. The building's upper six stories have been designated as a private full-floor residential area. It's also built to withstand an earthquake of magnitude 8. It was the world's most expensive private mansion in 2014, costing between US$1 to 2 billion to construct.

The showy exhibition alarmed Indian inhabitants in its early days, and even after it was completed. It's easy to see why, given that more than half of the population lives on $2 a day and Antilia overlooks a congested slum. There are multiple suspended chandeliers in the parlor rooms, bedrooms, and bathrooms. The big ballroom, which has an 80 percent crystal chandelier ceiling and leads out to a large bar, green rooms, powder rooms, and an "entourage room" for security officers and assistants to relax, is also available.

Cost: 2 billion USD