Huqiu Pagoda is the first leaning tower in China, just second to the Leaning Tower of Pisa in Italy. It was a symbol of the ancient city of Suzhou and also called Yun Yan Temple Tower. It was taken as the key protected relics of the country by State Department on March 4, 1961. It was built in 959, the sixth year of age of emperor Xiande reign in Late Zhou Dynasty (951?960), and finished in 961, the second year of the emperor Jianlong reign. Until now, it has experienced over a thousand years. This tower has seven stories and eight facades at the height of 47.7 meters, and with the largest dip angle of 3.95 toward northeast, 2.34 meters of departure from top the center. This is the earliest, most large-sized and excellent pagoda in south China. It has been leaning for almost a thousand years, but not yet fall down, so it has precious value in architecture, art, design, and history research. Huqiu and the tower have been witnessing great changes of Suzhou for over 2500 years.