Back in 2012, one of my mine exploring trips got canceled at the last minute, so I suddenly had some free time on my hands. I decided to try to find a supposed arrastra and petroglyph site out in the Mojave desert. Arrastras are always fun to find because they are so rare besides being historical. Petroglyphs are more common but can be equally difficult to locate. (Not to mention, they are both cool.)
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Rattlesnake Canyon Smelter and the Heartbreak Ridge Arrastra
Most people interested in the old mines of Southern California know about the old "Spanish" smelter on the eastern edge of the San Bernardino Mountains. It is just off Burns Canyon Road in Rattlesnake Canyon and is well-visited.

Chaparrosa Peak
There is nothing historical here, but this is a nice hike to a peak with great views just outside of Joshua Tree.
Directions
Getting There
The trailhead for this hike is at the visitor center in the Pioneertown Mountains Preserve, run by The Wildlands Conservancy.

Pipes Canyon
Pipes Canyon is a pleasant and easy hike. The trail heads out from the visitor center at the Pioneertown Mountains Preserve and follows the canyon up into a riparian habitat. The canyon is usually dry, but water does occasionally surface to support this isolated oasis.