The Pearl Tower, also known as the Pearl Tower, was built in the third year of Yuanfeng in the Northern Song Dynasty (1079), with a masonry structure, seven-story octagon and a height of 18.82 meters. Located in sheshan town tianmashan Scenic Area, Songjiang District, Shanghai, it is a cultural relic protection unit in Shanghai. Since the Millennium, due to the change of foundation, the tower has gradually tilted to the southeast. By 20 15, the Pearl Protection Tower is 2.28 meters eastward with an inclination of 7. 10. Because its inclination has surpassed the famous Leaning Tower of Pisa in Italy, it is known as the "Leaning Tower of Pisa in Shanghai" and has become a wonder in Shanghai.