On March 1, 1872 President Ulysses S. Grant signed into existence the world's first national park, Yellowstone National Park. The 2.2 million acres of wilderness is the only complete mid-latitude ecosystem left on the planet.
Documentary
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2011
Ron Meyer

2012
6.0

2021
8.0

2011
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1970
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2018
8.0

2017
7.7

2005
7.5

2022
8.0

2023
3.5

2015
6.9

2015
2.0

1984
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2013
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2009
8.2

2008
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1943
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1944
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1943
7.0

1936
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1934
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