World's Largest HouseThis is the home of Sultan of Brunei's istana nurul iman.
It contains 1,788 rooms, 257 bathrooms, and a floor area of 2,152,782 square feet (200,000 m²). Amenities include 5 swimming pools, and an air conditioned stable for the Sultan's 200 polo ponies, a 110-car garage, a banquet hall that can be expanded to accommodate up to 4,000 guests, and a mosque accommodating 1,500 people.
The palace was built in 1984 at a cost of around $1.4 billion USD and has 564 chandeliers, 51,000 light bulbs, 44 stairwells, and 18 elevators. It is also a home to a car collection that includes custom-made Ferraris and Bentleys as well as 165 Rolls-Royces.
It was designed by the National Artist of the Philippines for Architecture, Leandro V. Locsin and built by the Filipino firm, Ayala International.
The Sultan's palace is only open three days a year for the Islamic festival of Hari Raya Aidilfitri, marking the end of Ramadan. However, in 2009, Indian multi-billionaire Mukesh Ambani is scheduled to complete construction on the world's largest house.