Well I have the answer! The construction of the tower began in 1173. After completing the third story of the tower it began to tilt around 1274. Bonanno Pisano was the engineer who created and designed this masterpiece. But, what he didn't think of was the area that the tower was being built on. The base of the tower was created with clay, rubble, and sand; therefore, this was not firm enough to hold the 185-foot tower. There wasn't much that this engineer could do, but to continue his plan. The construction continued, but the tower was still uneven.
The tower was completed in 1350. There were large bells built at the top of the tower. But, then they caused the tower to tilt even further. The tower was now leaning seventeen feet toward the bottom. To solve this, the engineers evened out the soil on the bottom of the tower to even out the foundation. The tourists and locals were not able to climb the tower until the tower tilted in the opposite direction.
This information came from this website: http://adventure.howstuffworks.com/leaning-tower-of-pisa-landmark.htm
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