The Summer Palace () is a vast ensemble of lakes, gardens and palaces in Beijing. It was an imperial garden in the Qing dynasty. Inside includes Longevity Hill () Kunming Lake and Seventeen Hole Bridge. It covers an expanse of , three-quarters of which is water. Longevity Hill is about high and has many buildings positioned in sequence. The front hill is rich with splendid halls and pavilions, while the back hill, in sharp contrast, is quiet with natural beauty. The central Kunming Lake, covering , was entirely man-made and the excavated soil was used to build Longevity Hill. Inspired by the gardens in South China, the Summer Palace, there are over 3,000 various Chinese ancient buildings that house a collection of over 40,000 kinds of valuable historical relics from each dynasty. In December 1998, UNESCO included the Summer Palace on its World Heritage List. It declared the Summer Palace "a masterpiece of Chinese landscape garden design. The natural landscape of hills and open water is combined with artificial features such as pavilions, halls, palaces, temples and bridges to form a harmonious ensemble of outstanding aesthetic value". Notably in Chinese history, it is also the Central Route terminus of the South-North Water Transfer Project having traversed from Danjiangkou Reservoir, Hubei, making it Beijing's main water supply. History Pre-Qing dynasty The origins of the Summer Palace date back to the Jurchen-led Jin dynasty in 1153, when the fourth ruler, Wanyan Liang (r. 1150–1161), moved the Jin capital from Huining Prefecture (in present-day Acheng District, Harbin, Heilongjiang) to Yanjing (present-day Beijing). He ordered the construction of a palace in the Fragrant Hills and Jade Spring Hill in the northwest of Beijing. Around 1271, after the Yuan dynasty established its capital in Khanbaliq (present-day Beijing), the engineer Guo Shoujing initiated a waterworks project to direct the water from Shenshan Spring (神山泉) in Baifu Village (白浮村), Changping into the Western Lake (西湖), which would later become Kunming Lake. Guo aimed to create a water reservoir that would ensure a stable water supply for the palace. In 1494, the Hongzhi Emperor (r. 1487–1505) of the Ming dynasty had a Yuanjing Temple (圓靜寺) built for his wet nurse, Lady Luo, in front of Jar Hill (瓮山), which was later renamed Longevity Hill. The temple fell into disrepair over the years and was abandoned, and the area around the hill became lush with vegetation. The Zhengde Emperor