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The leaning tower of Pisa is part of the Cathedral Square in Pisa, Tuscany, Italy, which is a UNESCO world heritage site.Originally it was built as a bell tower (campanile) for the cathedral. The tower has leaned almost since construction started, due to faulty foundation and weak subsoil.istory of the Tower. Construction of the tower (in Italian: Torre pendente di Pisa) started in 1173, when the city of Pisa was prosperous. This makes it the third oldest structure of the Cathedral Square (Piazza del Duomo) in Pisa.
The tower began to sink after construction had progressed to the third floor in 1178. This was due to a mere three-meter foundation, set in weak, unstable subsoil, a de â¦ sign that was flawed from the beginning.       Tower of Pisa leans sideways because it was built on unstable soil. In 1173 construction started on the 180-foot bell tower, which is located in Pisa, a small town in the Italian province of Tuscany. The building began to lean as soon as the first three floors were completed.