Retrieving "Bonanno Pisano" from the archives

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1. Leaning Tower Of Pisa

   Linked via "Bonanno Pisano"

   Design and Construction History
   Construction of the tower began in August 1173. The initial phase was overseen by the architect Bonanno Pisano, who utilized a foundation of dense, low-strength Pisan soil resting upon underlying layers of soft marine clay and fine sand.
   The lean became apparent almost immediately after the construction of the second story, around 1178. This premature tilting was due to the inadequate foundation depth—only three meters—which could not support the structure's weight on the unstable s…