Forbidden City in Beijing, also known as the Forbidden City, it is situated in the city’s center. It was built between 1406 and 1420 or the 4th-18th years of the reign of Emperor Yong Le of Ming Dynasty. It was the imperial palace of the Ming and Qing Dynasties. The whole project occupies 720,000 square meters, with a floor space of 150,000 square meters and over 9,000 rooms. The palace is protected by a wall 10 meters high to be made inaccessible by a 52-meter-wide moat. All the structures are resplendent and magnificent-red walls, yellow tiles, carved beams and painted rafters. They are a complete palace structures extant. Only imperial palaces were allowed to have yellow tiles. (Commoners could only use gray ones.) This massive city was built by 100,000 artisans and a million laborers.