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Why is the Leaning Tower of Pisa tilted?
- It sits on unstable soil:The tower's initial purpose was a bell tower for the cathedral complex in the town of Pisa. After five years of construction, three of the planned eight stories were complete. That's when builders noticed the tower had begun to tilt. The foundation on which it was built was unstable and had begun to settle unevenly because the soil is a dense mixture of sand, clay, and shells. War halted construction for nearly a century, and the building settled further. When construction resumed, efforts to compensate for the tilt only made it worse. Completed in 1370, the lean of the tower increased over the next six centuries. Today, engineers believe repair efforts have stabilized the tower. Source: History.com
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