Taking 200 years to build the Leaning Tower of Pisa is one of the world's most iconic structures. Built in wet soil, engineers have been fighting gravity for nearly a thousand years. And seemingly by sheer willpower, the structure still stands today.

Sources

https://www.towerofpisa.org/; https://www.britannica.com/topic/Leaning-Tower-of-Pisa

https://www.pbs.org/wgbh/nova/pisa/interventions.html

Image: https://commons.wikimedia.org/wiki/File:Leaning_Tower_of_Pisa_in_the_1890s.jpg

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