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The Pantheon in Rome is a masterpiece of ancient engineering, featuring the world’s largest unreinforced concrete dome, spanning 43.4 meters. Built around 126 AD, it still stands intact nearly 2,000 years later—a testament to the durability of Roman concrete. Its unique design uses lighter materials toward the top and a central oculus to reduce weight. The use of volcanic ash and lime in its mix created a self-healing concrete that has resisted time. The Pantheon remains an architectural icon, inspiring modern concrete innovations across the world.
