^also in the area, the Giant Rock. Has a very interesting history. https://en.m.wikipedia.org/wiki/Giant_Rock
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Giant Rock is cool. It's the rock on the right, and you really can't tell just how big it is in this picture.
That wikipedia article is probably a bit thin. It mentions that "Critzer perished in a self-detonated dynamite explosion while being investigated . . .". I've seen several other accounts which mention the rest of the story, which appears to be that some locals didn't like him for some reason (he was German, it was WWII, and he had radio equipment and lived in a hollowed out room under the rock) so they got the San Bernardino County Sheriff's Department (keep in mind this is in Riverside County) to come out there. The sheriffs tossed in a tear gas grenade to try to get him out, and it apparently detonated the dynamite he kept under the kitchen table.
The Integratron website may still have a lot of the stories, including a lot about the setup that Van Tassel had out there at Giant Rock for many years.