The Pantheon in Rome stands as the world’s largest unreinforced concrete dome, a record it has held for nearly 1,900 years. Completed under Emperor Hadrian around 125 AD, the "Old Style" structure was a revolutionary leap in engineering, achieved through a sophisticated understanding of chemistry, physics, and weight distribution that continues to fascinate modern architects.1. The Recipe: Roman "Pozzolana" ConcreteThe secret to the dome's longe…
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