The chemical diversity of Roman concrete likely means not everything they tried worked equally well, but in the Colosseum and the Pantheon we have two irrefutable testaments to the material's success.At the Colosseum, concrete isn't necessarily the star of the show but it has played an integral role in the arena's survival. The most prominent material at the Colosseum is travertine limestone, but concrete is what holds the amphitheatre's many iconic archways aloft. Yet, perhaps the most significant contribution of concrete to the Colosseum's longevity is out of sight.
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