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How did early engineers carve tombs into rock cliffs and funnel water to this desert city?
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In Tampa, Florida, in February 2013, a giant hole in the ground opened up and swallowed...

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NOVA follows the epic operation to secure, raise and salvage the Costa Concordia cruise...
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NOVA  ·  Episode 4204

Hagia Sophia: Istanbul's Ancient Mystery

02/25/2015

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

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