[ed. Awesome. An example of the intrinsic economic value of undisturbed natural environments. A few more: eco-tourism, hunting and fishing lodges/preserves, photo-safari's; air taxi operations, outfitters, etc. etc. Many people just assume that if land isn't somehow 'developed' it's just sitting there, worthless. Then there are even worse ideas: like putting up a border wall/fence with miles of security and search lights to be installed at Big Bend National Park.]
Big Bend National Park is known as one of the outstanding places in North America for stargazing. In fact, it has the least light pollution of any other national park unit in the lower 48 states.