Hovenweep National Monument, UT
Located near the Four Corners region where Colorado, Utah, Arizona, and New Mexico meet, this is a very dark region of the USA. The campground at the park headquarters is the only place I was allowed to set up on National Monument land without a special use permit, but I hope to get one of those next time out and try one of the dispersed ruin sites that comprise the rest of the park. The head ranger at this location, Chris Nickel, is one of the most welcoming and helpful Park Service employees I've encountered in my adventures. The trick to using this particular site is to go in the dead of winter when nobody is using the campground to ensure that you don't get any stray light. There was one park building nearby, apparently a residence, that had some interior lights on during the night, but it was nothing that interfered with any of my shots. In the first photo below, some of the ancient ruins of the previous residents can be seen. The second photo shows the view from where I set up in the campground east toward Sleeping Ute Mountain back inside the Colorado state line.