As mentioned previously, Chaco Culture NHP in NM is an International Dark Skies Park. It even has its own observatory and telescope, so that visitors can view in close-up some of the features depicted in petroglyphs by the Anasazi 1,000 years ago.
I happened to be there one time when the Albuquerque Astronomy Society brought their telescopes. We were able to view many different parts of the sky--galaxies, star clusters, and planets--in just a single night. Absolutely the best night of astronomy I have ever had.