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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 of Pisa has been leaning so long -- nearly 840 years -- that it's natural to assume it will defy gravity forever. But the famous structure has been in danger of collapsing almost since its first brick was laid.It began leaning shortly after construction began in 1173.Builders had only reached the third of the tower's planned eight stories when its foundation began to settle unevenly on soft soil composed of mud, sand and clay. As a result, the structure listed slightly to the north.t began leaning shortly after construction began in 1173. Builders had only reached the third of the tower's planned eight stories when its foundation began to settle unevenly on soft soil composed of mud, sand and clay. As a result, the structure listed slightly to the north.