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The Leaning Tower of Pisa
The Leaning Tower of Pisa
The Leaning Tower of Pisa is the campanile, or freestanding bell tower, of the cathedral  of the Italian city of Pisa. Although intended to stand vertically, the tower began leaning to the southeast soon after the onset of construction in 1173 due to a poorly laid foundation and loose substrate that has allowed the foundation to shift direction. The tower currently leans to the southwest.

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