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Watch National geographic Ancient Megastructures online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Discover the secrets of revolutionary structures in Ancient Megastructures. Certain landmarks have captured the imagination and awe of modern-day architects and engineers around the world as they work to solve the mystery of how their ancient forebears were able to construct such beautiful, timeless and revolutionary structures with none of the machines and materials available to modern engineers.