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The hill is so-named because it is said to look like a crouching tiger. Another legend states that a white tiger appeared on the hill to guard it following the burial of King Helu.

Yunyan Pagoda, also known as Huqiu Tower, has been named China’s Leaning Tower of Pisa by world architects. Situated outside Changmen, Suzhou City, Jiangsu Province, it is also known as the Yunyan Temple Tower. The tower was built in the later period of the Five Dynasties (907-960 AD) and is 47 meters high. It is a seven-story octangular building built with blue bricks. The pavilion structure is extremely complicated and its color is magnificent. In more than a thousand years the tower has gradually slanted due to forces of nature. Now the top and bottom of the tower vary by 2.32 meters.

The tower leans because the foundation is originally half rock and the other half is on soil. In 1957, efforts were made to stabilize the tower and prevent further leaning. Concrete was also pumped into the soil forming a stronger foundation. During the reinforcement process, a stone casket containing Buddhist scriptures were found. The container had an inscription noted the completion date of the tower as the seventeenth day of the twelfth month in the second year of the reign of Jianlong (961 AD).

Although it is seven stories, there are no built-in staircases. People climbed to upper stories using movable ladders.

from Wikipedia

The Huqiu Tower rises through the fog. It is a Chinese pagoda situated at the top of Tiger Hill in Suzhou City, Jiangsu Province. It has several other names, including the Tiger Hill Pagoda and the Yunyan Temple Tower. O.G. Ingles writes that the better name for the Tiger Hill Pagoda should be the 'Leaning Tower of China', since it predates the famous Italian structure. The tower was built in the later period of the Five Dynasties (907-960 AD), completed by the second year of the Song Dynasty. The seven story tower rises to a height of 47 m (154 ft). It is a seven-story octagonal building built with blue bricks. In more than a thousand years the tower has gradually slanted due to forces of nature. The tower leans roughly 3 degrees because the foundation is originally half rock and the other half is on soil. In 1957, efforts were made to stabilize the tower and prevent further leaning. Concrete was also pumped into the soil forming a stronger foundation.