We visit some of the World's most extensive cave systems:

  • Lechuguilla Cave in Carlsbad Caverns National Park, New Mexico
  • Niah Great Cave on Sarawak, Malaysia, a World Heritage Site
  • Jillabenan and Yarragobilly Caves in Australia
  • Postojna Cave, Slovenia's most extensive cave system

Also seen are fossilized dinosaurs, and volcanic lava formations.

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