Construction of the tower of Pisa – which is part of the cathedral complex that includes three other buildings – started in 1172, thanks to the generosity of widowed nobleman Donna Berta di Bernardo.
Construction of the tower of Pisa – which is part of the cathedral complex that includes three other buildings – started in 1172, thanks to the generosity of widowed nobleman Donna Berta di Bernardo. Unfortunately, the architect overseeing the construction failed to properly survey the ground before starting, and the tower started to sink by the time the second floor had been built.