Article at New Scientist covers the potential risk to the rock art paintings here if the caves are opened to the public to help local tourism.
newscientist.com/article/dn21020-ancient-cave-paintings-threatened-by-tourist-plans.html
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I visited the replica caves at Altamira about 5 years ago...they are excellent and well worth a visit. Why reopen the originals when the replica cave shows everything so well without the dangers of destroying the originals?