The museum is also China's largest and most complete architectural grouping of ancient halls. Construction was begun in 1420; the eighteenth year of Yongle.Taihe Hall is 28 meters high and occupies a space of around 2,380 square meters. It is the largest hall in the Palace. Taihe Hall lays the Zhonghe Hall. This is a square hall with four ridge poles along the roofline that unite at the top in a large, round, gilded topknot called a baoding.
The museum is also known as the Purple Forbidden City in Chinese, or the Forbidden City as it is commonly known in English. It covers 720,000 square meters and was the imperial palace for a succession of twenty-four emperors and their dynasties during the Ming and Qing periods of Chinese history. The museum is also China's largest and most complete architectural grouping of ancient halls. Construction was begun in 1420, the eighteenth year of Yongle, so that the site has existed for the past 580 years. More than 70 halls of various sizes, containing more than 9,000 rooms, comprise the Forbidden City. These halls are aligned along a north-south axis, and extend out on either side in east-west symmetry. The central axis not only passes through the Purple Forbidden City, but extends south to Yongding Gate and north to the Bell and Drum Towers, for a length of some eight kilometers. In a concentrated form, this assemblage expresses China's artistic traditions in the setting of China's unique architectural style.