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The Tower of Pisa is one of the most famous architectural structures in the world and an icon of the city of Pisa in the Tuscany region of Italy. What makes the tower so well known is its characteristic tilt, which makes it look like it's about to fall. Its construction began in 1173, as part of an architectural complex that included the Cathedral of Pisa and the Baptistery. However, the tower began to lean shortly after the construction of the third floor, due to problems with the region's unstable soil. In addition to the tower, the Campo dei Miracoli (Field of Miracles) in Pisa is also home to Pisa Cathedral, the Baptistery and the Camposanto Monumentale, an ancient cemetery.