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Yellowstone National ParkSeeing the park from horseback gives visitors a chance to cover ground off the beaten path.
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Yellowstone National Park
Anatomy of a Hot Spring
Illustration of a hot spring.
A Hot Spring
 
At times, fierce, boiling waters within a hot spring (such as Crested Pool) can explode, shooting water into the air, acting much like a geyser. It is believed, however, that in the case of Crested Pool, no constrictions block the flow of water to the surface. The spring's wide mouth and 42-foot depth provide a natural conduit for superheated water to circulate continuously to the surface.
Summer Crowd at Old Faithful.  

Did You Know?
At peak summer levels, 3,500 employees work for Yellowstone National Park concessioners and about 800 work for the park.

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Last Updated: July 20, 2006 at 18:27 EST