The first of America's national parks, Yellowstone has been beguiling visitors with the power of Mother Nature since 1872. It's a park packed with natural wonders, from the rainbow-like Grand Prismatic Spring (see it from above on the popular Grand Prismatic Overlook Trail) to the regularly erupting Old Faithful Geyser.

It's also a habitat for some 67 species of mammal, from black and grizzly bears to bobcats and bison.

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