To the north of the Nine Dragon Wall, a building complex was built for the emperors who abdicated from the throne. It consists of Ningshou Gong (Palace of Tranquil Longevity), Yangxing Dian (Hall of Temper Cultivation), Leshou Tang (Hall of Joyful Longevity) and Yihe Xuan (Hall of Maintaining Harmony). This group of buildings is a microcosm of Forbidden City, for the Palace of Tranquil Longevity is equivalent to the Outer Court and the three remaining halls comprise the Inner Court.

The Palace of Tranquil Longevity was built in 1689 and was reconstructed during the reign of Emperor Qianlong. Huangji Men (Gate of Imperial Supremacy) is the south gate, with three arches decorated with colored glaze. Huangji Dian (Hall of Imperial Harmony), somewhat similar with the Hall of Supreme Harmony, served as the audience hall. The Hall of Tranquil Longevity was where the abdicant emperor worshipped to God. Now, the Hall of Imperial Harmony has been changed into a treasure gallery.

 Forbidden City Attractions: