Key Takeaways:
The Leaning Tower of Pisa was built between 1173 and 1399 and consists of eight colonnaded stories with 207 marble columns.
It started leaning in 1178, and since then, it has been leaning and falling at a rate of 1-2mm per year.
The tower is part of the Cathedral Complex, which includes a cathedral, baptistery, and cemetery.
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