Why the Leaning Tower of Pisa tilts
The Leaning Tower of Pisa's iconic tilt stems from its shallow foundation settling unevenly into soft, unstable subsoil, transforming a construction flaw into an enduring global landmark.
The Leaning Tower of Pisa famously leans because its shallow foundation was built on unstable, soft subsoil that compressed unevenly. Construction began in 1173, but by the third story in 1178, the tower already showed a noticeable tilt due to the ground sinking more on one side.
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