The Leaning Tower of Pisa, or simply the Tower of Pisa, is the freestanding campanile of Pisa Cathedral, known for its nearly four degree lean caused by an unstable foundation. It is one of three structures on Pisa's Cathedral Square, alongside the cathedral itself and the Pisa Baptistry. Its flawed foundation has made it one of the most visited tourist attractions in the world and an architectural icon of Italy, drawing more than five million visitors each year.
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