The Tower of Pisa wasn’t leaning when it was built in 1173; it was as straight as a pole. It only began to shift direction shortly after construction due to a poorly built foundation and a loose layer of subsoil. It was leaning to the southeast, at first, before the unstable foundation shifted and started leaning towards the southwest. After a phase of structural strengthening in the early twenty-first century, [...]

Categories: Construction
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