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10 Unbelievable Examples Of Things Being Worn Down Over Time

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It’s Just Marble

Credit: Selena Lettera / www.salenalettera.com

Everyone wants to see the world’s greatest wonders, and Leaning Tower of Pisa is no exception. However, countless visitors climbing the marble staircase that leads to the top of this magnificent tower have worn down the solid stone! While each footstep might seem like nothing to a piece of polished rock, millions and millions of footsteps add up over time.

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