The Leaning Tower of Pisa

The Leaning Tower of Pisa leans because part of the soil on which it is built is softer than the other side. Because of this, the Tower has gradually started to slant more and more. Many renovations have been done in order to preserve the Tower. For a while no one was allowed to climb it. Now people are, however the rule is no more than fifteen people per half hour. The tower is a freestanding bell tower for the nearby cathedral. It is from the top of this tower that Galileo performed his most famous experiment in which he dropped two objects of different weights and found that they hit the ground at the exact same time. This demonstrated that gravity accelerates everything at the exact same rate. g=9.8m/s2.