Who built the Leaning Tower of Pisa?
This wonderfully erratic timeline of events details the tumultuous history of the listing monolith in question. Construction started in 1173, then stops 5 years later (some trouble with the foundation, perhaps?), then recommences 100 years later, then stops after 6 years, and on and on. Why does the tower tilt? It's built on especially sandy soil, which has settled unevenly over the years.
A lot of effort has gone into straightening the tower, including an ill-advised drilling technique in 1934 that only exacerbated the problem. As it stands today, scientists and engineers are slowly but surely righting the structure to a stable angle. The aim isn't to straighten it (what's the Leaning Tower of Pisa without its lean?), but to stop it from tumbling over.
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