What is the Leaning Tower of Pisa?

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The Leaning Tower of Pisa is the bell tower of the Cathedral of Pisa in Italy. It is known so because when the tower was half completed, the soil under half of this circular building began to subside and the tower leaned. It was started to be built in 1173 and was discontinued for about half a century after subsidence. The building of the tower started again in 1275 when architects devised ways to stop further leaning by making the storeys in a way to alter the tower's centre of gravity. But the leaning continued. The tilt now is about 17 feet or more than 5 degrees from the perpendicular and it continues its tilt by an inch every year. The tower is made up of white marble and has eight storeys.

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