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Twenty-five years ago, NASA launched one of the most ambitious experiments in the history...
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How did early engineers carve tombs into rock cliffs and funnel water to this desert city?

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How has this unique structure, built on a seismic fault, survived centuries of quakes?
NOVA  ·  Episode 4206

Colosseum: Roman Death Trap


1500 years ago, how did the Romans engineer bloody spectacles and reenact sea battles?

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