Death Valley -
Death valley is one of the largest national parks in the United States, located east of the Sierra Nevada between the Mojave desert and Great Basin. The oldest rocks here date back 1.7 billion years and native americans inhabited the area as early as 7000 BC. At 86 feet below sea level, Badwater basin is the second lowest point in the western hemisphere while the Panamint mountain range is the highest at 11,049 feet.
Link to Death Valley U.S national Park website
Canyon de Chelly -
White Sands -
Needles district -
here is a link to the Canyonlands N.P trailguide
Saguaro Park, Sonoran Desert -
Bryce Canyon -
Natural Bridges national monument -
The three bridges in the park are named Kachina, Owachomo, and Sipapu (the largest), which are all Hopi names. A natural bridge is formed through erosion by water flowing in the stream bed of the canyon. During periods of flash floods, particularly, the stream undercuts the walls of rock that separate the meanders (or "goosenecks") of the stream, until the rock wall within the meander is undercut and the meander is cut off; the new stream bed then flows underneath the bridge.