Chaco Culture National Historical Park

Photo: kojihirano/istock

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6. Look Up and Say "Ahh": Chaco Culture National Historical Park, New Mexico
After you've taken in the park's "great houses"—stone and wood buildings erected roughly 1,000 years ago by the Chacoans, an ancestral Pueblo people—crane your neck to enjoy one of America’s best stargazing sites. More than 99 percent of the park is a “natural darkness zone” with no outdoor lighting—optimal conditions for pondering the universe.