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26:46
Native cultures view snakes as spiritually significant elements of nature.
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26:46
Our largest national park has become an important natural laboratory.
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26:46
The once-great Colorado River faces a dried-out future as more rely on its resources.
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26:46
Phantom Ranch, accessible only by trail, is the Grand Canyon's sole permanent settlement.
26:46
Boating through the Grand Canyon provides a setting for reflection on the Colorado River.
26:46
One of the world's greatest cities deals with falling water tables and sinking earth.
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26:46
Explore the volcanoes created the Galápagos Islands.
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26:46
Discover Cuba's capital city, Havana.
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26:46
Explore the never-ending race to survive climate changes in the Galapagos Islands.
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26:46
Travel along the 500-mile-long Blue Ridge Parkway, part of our national park system.
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26:46
Explore how cities and countryside adapt to drought in the American Southwest.
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26:46
Explore the states of Oaxaca and Chiapas in southern Mexico.