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Uncover the secrets of ancient civilizations in this "Nova" special by visiting five sites and watching the experts at work. Archaeologists, engineers and historians explore Incan villages and bridges, attempt to replicate the canopy that covered the Roman Colosseum, and use Stone Age tools to create a Stonehenge-like structure. They also test construction theories by erecting an 18-foot stone pyramid and building an obelisk without modern tools.