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In 1174 the Italian architect Bonnano Pisano began work on what would become his most famous project: A separately standing bell tower for the Cathedral of the city of Pisa. The tower was to be eight-stories and 185-foot-tall tall. There was just one "little" problem: builders quickly discovered that the soil was much softer than they had anticipated, and the foundation was far too shallow to adequately hold the structure! And sure enough, before long the whole structure had begun to tilt... and it continued to tilt... until finally the architect and the builders realized that nothing could be done to make the Leaning Tower of Pisa straight again. It took 176 years to build the Tower of Pisa and during that time many things were done to try and compensate for the "tilt." Foundation was shored up; the upper levels were even built at an angle to try to make the top of the tower look straight. Nothing worked. The tower has stood for over 800 years, but it leans 18 feet away from where it should be. One day, experts say, it will fall. All because it wasn’t built on the right foundation.