It can always be left up to to find something new and enlightening in a subject. This is no exception. It is worth a look simply for the Chinese Longmen Grotto picture and description (see above). The article describes this and ten other cave systems you may not have heard about. Mmm, the one from California does look suspiciously familiar though. Was an episode of Bay Watch filmed there?
From the article
Deep caverns in the rock, illuminated by the sun or artificial lamp, provide shelter, home, and repository for art and cultures. They are places of mystery, history, and intrigue.
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