The Cathedral's bell tower is the Leaning Tower of Pisa located in Pisa, Italy. The building of the Leaning Tower of Pisa started in August, 1173. The construction lasted for 2 centuries. It was believed in the past that the shape of the Tower of Pisa was planned all along, since the start of the construction. Today, we know that that is not the truth. The Tower of Pisa was planned to be straight, but it began to lean in the middle of construction.
Because of the shape and the beauty of the Tower of Pisa, from 1173 to today, the Leaning Tower of Pisa is the center of special attention and attraction from sightseers. During the building of the Tower of Pisa, people tried to stop the Tower from leaning using different devices. The Tower leans because the soil underneath cannot support it. Certain construction things are done to prevent the Tower from falling over. This way, the Tower of Pisa will stay standing for a long time so many more people from around the world can visit it.