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  1. Mammoth Cave National Park, Cavern: Retro Travel Poster
  2. Lotus
  3. Carlsbad Caverns National Park, Adventure: Graphic Travel Poster
  4. Mammoth Cave National Park, Cave Entrance: Retro Travel Poster
  5. Zhijin Cave, the largest in China at 10 km long and 150 high, Guizhou Province, China
  6. Large Ice Cave In The Vatnajokull Ice Cap, Southern Iceland, Iceland
  7. Lava River Cave, Lava Lands, Oregon
  8. Split shot of stalactites and stalagmites in a cave, Australia