The entrance to the Palace of Tranquil Longevity is marked by a glazed-tile Nine Dragons Screen. A Nine-Dragon Wall or Nine-Dragon Screen (九龙壁; pinyin: Jiǔ Lóng Bì) is a type of screen wall with reliefs of nine different Chinese dragons. Such walls are typically found in imperial Chinese palaces and gardens. The Forbidden City (Chinese: 故宫; pinyin: Gùgōng) is a palace complex in central Beijing, China. It houses the Palace Museum, and was the former Chinese imperial palace from the Ming dynasty (since the Yongle Emperor) to the end of the Qing dynasty (since the Shunzhi Emperor) (the years 1420 to 1912). The Forbidden City served as the home of Chinese emperors and their households and was the ceremonial and political center of the Chinese government for almost 500 years.