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A gargantuan stone arch marks the entrance to a vast “Paleolithic Cathedral” recently stumbled upon by explorers in .

Ignacio martCourtesy of university murciaUniversity of murciaJaumei universityUniversity of almerAlmadenes canyonCueva del arcoProfessor martDidac romTimes photoCueva delDel arcoProfessor lermaCave systemThe epoch times