I am sure that the Leaning tower of Pisa lean is caused because the ground that it was built on is too soft and unable to support the weight of the tower, causing the tower to subside.
Begun in 1174 as a campanile (bell tower) for the cathedral complex, the leaning tower of Pisa has become famous for its tilt of 3.9 meters from the perpendicular due to the uneven settling of its foundations.
When its lean became noticeable on the completion of its third storey, the engineer, Bonnano Pisano, compensated by increasing the height of its storeys on the short side. He was unsuccessful and the tower sank even further. Although work was stopped several times, the tower was eventually completed in the fourteenth century and although in this century the foundations have been strengthened, the tower is still in grave danger of falling.
Like the rest of the cathedral complex, the tower is built of white marble in a blend of Romanesque and Gothic styles typical of Pisa. An unsupported legend has it that Galileo developed his theories on falling bodies by dropping weights from the tower to the ground.
The famous tower of Pisa began to lean even before it was completed.
The leaning tower of Pisa, in Italy, was begun in 1174, as a bell tower, or campanile, for the nearby cathedral. The foundations were laid in sand and only three of the eight storeys were finished before it began to lean. The plans were altered to compensate for the problem and the building was eventually completed in 1350. The 54.5-metre tower has continued to lean a little more each century and has been anywhere between 12-17 feet out of the perpendicular. Some experts believe that no matter what they do, the tower will steadily go on leaning over until one day it falls.
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