What do you think of when you hear the phrase "national park"? Maybe sweeping vistas of canyons, volcanoes, geysers and glaciers? Maybe mountains - bare and rocky or green and hazy - that rise and fall in reams and rows and out of sight? Maybe wildlife like bison or wolves or thick-horned, hardy ungulates? Maybe your favorite public playground, or a distant, inaccessible place? The national parks are indeed this, and so much more.

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