The Learning Tower of Pisa in Pisa is a fluke of architecture, as when the tower was contructed it immediately started to sink into the marshy ground beneath it.
This gave the tower its signature crooked stance, and at various times in its existence it has been both open and closed to the public as architects struggle to asses if it is safe to enter.
When the tower is open, you can climb to the viewing platform at the top where you can look across all of Pisa.
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