Editor’s Note: This CNN Travel series may have adjacent ads by the country it highlights. CNN retains full editorial control over subject matter, reporting and frequency of the articles and videos, in compliance with our policy . Ulaanbaatar, Mongolia CNN  —  Many American schoolchildren grow up learning that Yellowstone was the world’s first national park. But across the globe in Mongolia, just south of the capital, Ulaanbaatar, a mountain holds a claim to the crown. Like many things in