Though it's probably gone unnoticed by most folks speeding by on their way to Vegas, a million and a half acres that lie east if Barstow and south of I-15 are a park. Called the Mojave National Preserve, it's the third largest national park in the lower 48. This year the Mojave turns ten years old. For the 3rd part of our Desert series, KPCC's Ilsa Setziol explored the park and brings us this report.