In Colorado there is the Mesa Verde National Park, Royal Gorge, Blue Mesa Reservoir, Canyon of the Ancients National Monument, Yucca House National Monument, San Juan National Forest, Uncompahgre National Forest, San Isabel National Forest, Great Sand Dunes National Park and Preserve, and Bent's Old Fort National Historic Site.
In California and Nevada there is the Death Valley National Park, Joshua Tree National Park, Mojave National Preserve, Humboldt-Toiyabe National Forest, and the Lake Mead National Recreation Area.