Ancient Structures That Defied Time | Ancient Structures: Secrets Revealed | National Geographic UK

More than a thousand years after the fall of the Roman Empire, structures like the Pantheon are still standing, and modern scientists are only now uncovering why.

From self-healing Roman concrete and the revolutionary design of the Pantheon's dome to the astronomical precision of Angkor Wat, ancient engineers created structures that continue to challenge modern understanding.

Researchers reveal how volcanic ash allowed Roman concrete to repair its own cracks, how Khmer builders used vast water systems to stabilise Angkor Wat, and how the Romans may have flooded the Colosseum using gravity-powered aqueducts and ingenious hydraulic engineering

Across continents and centuries, these remarkable structures prove that some of history's greatest innovations were built long before modern technology existed.

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