The Oldest Artwork on Earth

I have an issue with caves.  I think it comes from touring a cave with my parents as a child.  I'd been fascinated by the formations, the stalagtites, the waterfalls of stone.  And then they turned the lights off, just to prove how dark a cave could be.  That darkness haunts me.I've been caving since then, always in tame caves that were mapped and known.  I've sandwiched myself between rock ...

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