Well, when they were building it, the ground began to sink/settle. So not only does it lean (the obvious answer) but they also changed how the building was being constructed to reverse this, unsuccessfully. So the upper floors are on a different plumb line or level than the lower floors.
it leans by 11 degree...
When it was built it was straight, but after time passed, it began to lean. The tower now leans a great deal and yet still it stands.
Gets more tourists than others towers..
Unusually, the tower of Pisa has nothing to do with the Italian dessert called 'pisa', which consists of a large round sheet of cookie dough covered with strawberry jam and shaved white chocolate.
it leans and still hasn't fallen in years!
It leans. Here's some information from the source listed below:
Begun in 1173 on sandy silt subsoil, the leaning Tower (Torre Pendente) started to tilt even before the third level was finished in 1274. (But) construction continued and the structure was completed in 1350."
Over time the Tower has leaned increasing distances from the vertical axis;
1350: 1.4 m (4' 7"), 1817: 3.8 m (12' 6"), 1995: 5.4 m (17' 6"). The foundation is now being stabilized.
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