What primary type of local limestone was used to construct the massive outer walls of the Colosseum?
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Travertine limestone, quarried in nearby Tivoli, forms the main load-bearing pillars of the Colosseum. Over 100,000 cubic meters of this stone were transported to Rome using a purpose-built road. The stone was held together not by mortar, but by thousands of iron clamps. Photo: Frank Schulenburg, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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