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Yellowstone National Park
Anatomy of a Hot Spring
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![Seventh Cavalry Ensignia Pin. Seventh Cavalry Ensignia Pin.](https://webarchive.library.unt.edu/web/20081014075430im_/http://www.nps.gov/imr/customcf/apps/CMS_HandF/Pictures/YELL_cavalryemblem.jpg) |
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Did You Know?
Prior to the establishment of the National Park Service, the U.S. Army protected Yellowstone between 1886 and 1918. Fort Yellowstone was established at Mammoth Hot Springs for that purpose.
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Last Updated: July 20, 2006 at 18:27 EST |