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The Hidden Wonder of the World
Season 15
Episode 2
The hidden wonders of one of America's greatest engineering feats are revealed in The Hidden Wonder of the World: The Transcontinental Railroad from Sacramento to Donner Summit. Travel to the summit of the Sierra Nevada and marvel at how the master engineers and builders of the 1860s accomplished this heroic deed.
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26:46
Explore California's agricultural bounty and meet the people who make it succeed.

26:56
Explore the past and present of California’s rich agriculture.

26:10
Public-private collaborations are protecting threatened and endangered species.

28:34
Urbanization and artifact looting threaten the histories of the Koi and Habematolel Pomo.

26:46
Visit an elementary school that's growing future pilots.

56:46
Examine how fire suppression and climate change have made wildfires more severe.

26:57
Explore one of California’s most compelling Gold Rush towns.

26:46
Explore the local impact of aviation history and education.

26:50
Explore the problem of contaminated drinking water for over 1 million California residents

26:46
Meet dogs who help humans navigate the world, control anxiety, heal, and more.

26:52
Discover the archive of a Chinatown family photo studio.

26:46
Meet three resilient individuals facing vision loss.