剧情介绍
WhatmakesAmerica'snationalparkssospecial?Whyaremillionsofpeopledrawntotheseparksfromallaroundtheworldyearafteryear?ThesecretsofsomeofAmerica'smostprofoundnationalparksareunearthedhere,andyourjourneyintoeachparkwillhelpyouclearlyunderstandtheimportanceofpreservingandconservingourEarth'swildlands.
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