In 2015 alone more than 300 million people visited the US national park system. Some stayed for a few hours, others for a few days – and, occasionally, some never make it out.
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Sources & Links:
National Parks: An American Legacy
Keeper of the Flame
Eruption of Mount St. Helens, 1980
Thank You Safety Sue
The Physics of Falling
Handtools for Trail Work – Part 1
Home Movie: 97310: Across the Grand Canyon
Home Movie: 97319: Hiking the Grand Canyon
Home Movie: 10938: Travels in California
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Why do people disappear in national parks?