Why hasn't the Leaning Tower of Pisa fallen down yet?

Why hasn't hasn't the the Leaning Leaning Tower Tower of of Pisa Pisa fallen fallen down down yet?

a.bereslavets
 
Why hasn't the Leaning Tower of Pisa fallen down yet?
Source
Why hasn't the Leaning Tower of Pisa fallen down yet? - My, Leaning tower of pisa, Construction history, Neural Network Content

Neural Network Content Leaning tower of pisa Construction history
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