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Great temples built to honour the gods, have led to groundbreaking construction techniques, and pushed the limits of engineering. No expense was spared in the ancient world, as temples were built over decades or even centuries. But one stands out from the rest. Hidden deep in the Cambodian jungle lies a temple that eclipses all others.

Angkor Wat is a 900-year-old complex covering more than 400 acres across a monsoon-plagued swampland. The largest religious monument in the world by land area. Its endless hallways and colossal structures exhibit precision stonemasonry. While some of the great medieval cathedrals took over a century to build, Angkor Wat was completed in just 30 years. A masterpiece of craftsmanship, sculptural decoration and engineering. But how did an early society with little technology build this vast monument?