昆明湖
The Qianlong Emperor was an aggressive builder. In the hills northwest of Beijing, he expanded the villa known as the "Garden of Perfect Brightness" (Yuanmingyuan) (now known as the Old Summer Palace) that was built by his father. He eventually added two new villas, the "Garden of Eternal Spring" and the "Elegant Spring Garden". In time, the Old Summer Palace would encompass , five times larger than the Forbidden City. To celebrate the 60th birthday of his mother, Empress Dowager Chongqing, the Qianlong Emperor ordered a lake at the "Garden of Clear Ripples" (Qingyiyuan) (now known as the Summer Palace) dredged, named it Kunming Lake, and renovated a villa on the eastern shore of the lake.