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How far have humans pushed boundaries to make their mark on the surface of the world? From an underground labyrinth of tunnels excavated in total darkness, to cities thriving against all odds in barren deserts, our ancient ancestors have designed and built improbable structures that even rival the engineering marvels of today. Delve into how the Mesopotamians developed the simple mud brick to withstand flash flooding in order to build a monumental temple to their god, or how monks chose a cliff face for the site of their place of worship, and how the King of Judea built a citadel on a plateau 1,300 feet above sea level. Step back in time to unearth the unimaginable ingenuity and creativity of these ancient civilizations and how their legacy of going to the extreme lives on in the pioneering work of modern engineers.