Sky brightness over the southwestern US and northwestern Mexico and some of the sites suitable for dark sky observations. The dots are the approximate locations of 1) Death Valley National Park, 2) North Rim of the Grand Canyon, 3) Canyonlands area of Utah, 4) Gila Mountains of New Mexico, 5) Chiricahua National Monument (Arizona), 6) Kenton, Oklahoma – site of the annual Okie-Tex Star Party, 7) Big Bend National Park, 8) The location of the 3RF (Three Rivers Foundation) Astronomy Campus. The 3RF is the closest gooddark sky location to the Dallas-Ft Worth Metroplex.