The tower began to lean as soon as its construction began in August 1173, height of 55.7 to 55.8 meters from the base, weight is estimated at 14,700 tons and incline of about 4 °, extending three 9 m from the vertical. It has 8 levels: a base of 15 blind arches with columns, adorned with six levels open semicircular arches and a bell tower on top. The internal spiral staircase has 294 steps. It is considered, along with the Cathedral of the part, a jewel of Romanesque art.
The government of Italy requested aid on February 27, 1964 to prevent its collapse, and January 7, 1990 it was closed to the public as a safety measure. In May 2008, after the removal of 70 metric tons (70 000 kg) of earth, engineers announced that the Tower had been stabilized such that it had stopped moving for the first time in its history. They stated it would be stable for at least 200 years. He turned to allow entry to the public on June 16, 2001, after completion of 10 years of work. (Speaker Icon.svg Hear the sound of the bells.).
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