Industry
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What was once the ocean floor provided raw materials, silica sand, for glass making during the early twentieth century. When R. Marvin Greathouse began hollowing these hills to mine the silica sandstone, the cavernous rooms left behind became vast underground spaces with an intriguing human and geologic history that would fascinate people for decades to come. Today the Greathouse Portal opens into a unique underground visitor center and gateway to the past.
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ExploreHere reads historical markers out loud as you pass them: over 325,000 stories across the US. No account needed.
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California · United States
