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M. has basked in the fame of nearby Carlsbad Caverns National Park, with its awesome underground stalactites and stalagmites.
FORBES: How Carlsbad got WIPPed
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Once inside visitors can see stalactites and stalagmites, as well as limestone.
FORBES: By Sonya Angraini (Forbes Indonesia)
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"The stalactites and stalagmites from these caves are a way of looking back in time to see how warm periods similar to our modern climate affect how far permafrost extends across Siberia, " said Dr Anton Vaks from the University of Oxford.
BBC: Siberian cave