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150 years on, preservation is still a challenge at Yosemite




Mammoth Peak reflected in Tioga Lake, Yosemite National Park
Mammoth Peak reflected in Tioga Lake, Yosemite National Park
Derek Wolfgram/flickr Creative Commons

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Yosemite National Park is celebrating a law signed on this day in 1864. It saved one of the country's most spectacular landscapes, and planted the seed for the national park system.

Sasha Khokha reports that even as Yosemite celebrates, the job of preserving its wonders for the future remains a challenge.