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Leaning Tower of Pisa

The leaning tower of Pisa is the freestandng seven bell tower of the cathedral. The story goes that Galileo Galilei dropped two canon balls of different weight from the top of the tower, to demonstrate that they would still reach the ground at the same time. At its worst, the tower leaned 5.5 degrees. Engineers have now stabilised it at 3.99 degrees. The foundations were laid on the 9th of August 1173.
See Also: http://en.wikipedia.org/wiki/Leaning_Tower_of_Pisa

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