The Istana Nurul Iman palace is the official residence of the Sultan of Brunei, Hassanal Bolkiah. But Buckingham Palace at 828,818 square feet (77,000 m2), Buckingham Palace bears the title of the world\'s largest \"working\" royal palace.
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The Forbidden City, extending 753 meters from east to west, and 961 meters from north to south, makes a rectangular shape and covers a total area of 720,000 square meters. It consists of several dozen compounds of varying sizes and some 9,900 bays of rooms, with a total floor area of 150,000 square meters. Most of the buildings were built with wood, roofed with yellow glazed tiles and built on blue-and-white stone foundations, looking solemn and brilliant. City walls were 10 meters high, and a 52 meter-wide moat surround the Forbidden City. Three-storied towers are placed at each corner of the wall.