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and get you in the hot water. The historic events that happened on this day in 1173, the beginning of the construction of the Cathedral of Pia, known as the Leaning Tower of Pia, began. It took two centuries to complete. Towers tilt began during construction in the 12th century caused by an inadequate foundation on ground too soft on one side to properly support the structure's weight. It was increased in the decades before the structure was completed in the 14th century. It gradually increased until the structure was stabilized, but the tilt was partially corrected by efforts in the late 20th and early 21st centuries. In the 1990s, a Columbia returned to Boston Harbor after a three-year voyage. Columbia was the first ship carried the American flag around the world. 1803, Robert Fulton tested his steam paddle boat on the river Sun in France, but it sank. Great guy. Robert Fulton was an American engineer.