NOVA

自然 · 历史

S37 E12 Ghosts of Machu Picchu

本集简介

Why did the Incas abandon their city in the clouds?

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2010/01/19 S37 E11

Riddles of the Sphinx

A marvel of ancient engineering is vanishing. Can it be saved?

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2010/02/09 S37 E13

Extreme Cave Diving

A team of intrepid scientists journey into one of Earth's most dangerous and beautiful underwater frontiers.

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