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<p>[QUOTE=&quot;Robidoux Pass, post: 8374873, member: 96691&quot;]The Pantheon in Rome is truly an impressive building. As an engineer, I can say that its use of concrete for the dome was groundbreaking.&nbsp; </p><p><br /></p><p>When I was working in Egypt to construct port facilities and a grain import silo at the Red Sea port of Safaga, the ancient Roman quarries at Mons Claudianus were ca. 40 km away.&nbsp; Those immense columns in the Pantheon&#039;s portico came from this quarry in the Red Sea Mountains of Egypt.&nbsp; The columns were quarried and then conveyed across the desert over 100 km to the Nile River, eventually to be floated down the Nile, and then by ship across the Mediterranean Sea to Italy.&nbsp; Just the quarrying and transportation were an engineering feat.[/QUOTE]</p><p><br /></p>

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