![]() To make up for the tilt, builders made each new tier a little taller on the short side - but the additional stone only made the tower sink more. The structure continued to settle unevenly. And this thin base rests on soft sand, rubble, and clay - not firm underpinnings for an almost 16,000-ton tower. ![]() Perhaps engineer Bonanno Pisano failed to consider the consequences of designing a 185-foot-tall tower with a stone foundation only about ten feet thick. Much to the embarrassment of Pisans, however, their white marble tower began to tilt even before its third story was finished in 1274. When construction of this campanile began in 1173, Pisa was a trading center at the peak of its military might and artistic achievement. ![]() In fact, people have been having fun with the tower's tilt for centuries. Tourists stand in front of the tipsy tower, leaning at a jaunty angle themselves, and take snapshots in which they seem to disobey the laws of gravity. One of the world's most recognizable buildings is surely the Leaning Tower of Pisa. ![]()
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