The leaning tower of Pisa is significant because of its unique leaning angle. The tower was originally designed to stand vertically, but due to a weak foundation, it started leaning during its construction. The lean has become a symbol of architectural miscalculation and human error. Despite its lean, the tower has stood for over 800 years and has become a popular tourist attraction in Italy. The tower has also undergone extensive restoration and safety measures to prevent the lean from worsening or causing the tower to collapse.
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