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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 weighs about 14,500 tons. That's a lot of weight for a building to have to support when it has been leaning since it was built. There are approximately 294 steps on the north side and 296 steps on the south side of the tower. The Leaning Tower of Pisa took 344 years to build, beginning in August 1173.It began to lean in 1178 once construction on the second floor had begun. The lean was due to one side sinking into the soft ground.he tower weighs about 14,500 tons. That's a lot of weight for a building to have to support when it has been leaning since it was built. There are approximately 294 steps on the north side and 296 steps on the south side of the tower. The Leaning Tower of Pisa took 344 years to build, beginning in August 1173.