United States of America
Castle Mountains National Monument is a U.S. National Monument located in the eastern Mojave Desert and northeastern San Bernardino County, in the state of California. The park protects 20,920 acres, located between the interstates I−15 and I−40, and northwest of the Colorado River.
Listen to the audio guide for Castle Mountains National Monument Free on WIP — starts by itself when you arrive, even with the screen off