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Leaning Tower Of Pisa Italy Europe Architecture

The Leaning Tower of Pisa looks like it could tip over. But it doesn’t. Even though it leans, it has survived several powerful earthquakes. How it stays standing has been a mystery for hundreds of years. Now scientists think they know the reason. Something called dynamic soil-structure interaction, or DSSI, has kept the Tower upright for all these years. DSSI is a combination of the Tower’s height, the stiffness of the marble it’s made of, and the soft soil it’s built on. Together these keep the tower from shaking during earthquakes.

Read more about the Leaning Tower of Pisa.

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