Before the I-5 connect Southern and Central California over the Grapevine, there was a old route, constructed in the 1900's that followed the ridge lines. And it seems this old route is still accessible.
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From @calimeatwagon
Before the I-5 connect Southern and Central California over the Grapevine, there was a old route, constructed in the 1900's that followed the ridge lines. And it seems this old route is still accessible.