Closest City: Cody, WY
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Coolest Feature: Seeing Old Faithful for the first time.
The world's very first national park is centered on the Yellowstone Caldera, the largest supervolcano on the continent (it has entrances in three states), and features many geothermal features, like geysers and hot springs. The entire park was formed from the volcanic rock of the Caldera, which is the largest remaining, nearly intact ecosystem in the Earth's northern temperate zone, and therefore home to some of the best animal and bird watching in the world.