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TheYellowstoneParkYellowstoneNationalPark,establishedbytheU.S.CongressandsignedintolawbyPresidentUlyssesS.GrantonMarch1,1872,isanationalparklocatedprimarilyintheU.S.stateofWyoming,althoughitalsoextendsintoMontanaandIdaho.Yellowstone,widelyheldtobethefirstnationalparkintheworld,isknownforitswildlifeanditsmanygeothermalfeatures,especiallyOldFaithfulGeyser,oneofthemostpopularfeaturesinthepark.YellowstoneNationalParkspansanareaof3,468.4squaremiles(8,983km2),comprisinglakes,canyons,riversandmountainranges.YellowstoneLakeisoneofthelargesthigh-altitudelakesinNorthAmericaandiscenteredovertheYellowstoneCaldera,thelargestsupervolcanoonthecontinent.Thecalderaisconsideredanactivevolcano.Ithaseruptedwithtremendousforceseveraltimesinthelasttwomillionyears.Halfoftheworld'sgeothermalfeaturesareinYellowstone,fueledbythisongoingvolcanism.LavaflowsandrocksfromvolcaniceruptionscovermostofthelandareaofYellowstone.GrandCanyonTheGrandCanyonislocatedinthenorthwestoftheStateofArizona,formedbytheColoradoRiveraftermillionsofyearsoferosion,colorfulandsteepcliffs.In1979GrandCanyonwaschosenintheWorldHeritageGrandCanyonSkywalkknownastheeighthwonderoftheworld.VisitorsstandingintheGrandCanyonSkywalk,youcanenjoya720degreeangleoftheGrandCanyonspectacle.CarvedintoacorneroftheArizonaplains,thegreatroaringriver,toweringrockformationsandbreathtakingvastnessoftheGrandCanyonserveasamonumenttotheboldandenduringspiritofAmerica.END