Closest City: Hot Springs, AR
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Coolest Feature: Taking a bath in a mountain fed hot springs, bathhouse.
The only park in America located in an urban area and the smallest park to boot, Hot Springs is all about the sensation and health benefits of an all-natural spa (and they mean all-natural). The hot spring water has been used in therapeutic baths for centuries in order to cure rheumatism and a number of other ailments. The water is naturally potable, full of minerals and—bonus—makes a great toddy.