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  1. Painting of shield on a rock, Bear Gulch Pictographs, Montana
  2. Arizona, Canyon de Chelly National Monument, Mummy Cave Ruin in Canyon del Muerto
  3. Luray Caverns, Virginia - Wishing Well: Retro Travel Poster
  4. Limestone in a cave, Carlsbad Caverns National Park, New Mexico
  5. Rock formations in the Pacific Ocean, Cathedral Cove, New Zealand
  6. Antelope Waterfall
  7. Low angle view of the ceiling of a cave, Hall Of Giants, Carlsbad Caverns National Park, Carlsbad, New Mexico
  8. Boat in Fingal's Cave, Staffa, off Isle of Mull, Scotland, United Kingdom
  9. Famous Cave At Benagil Beach In Algarve Portugal
  10. Marble caves, Lago Carrera, Patagonia, Chile
  11. Wind Cave National Park, Cave Interior: Retro Travel Poster
  12. The Giant Dome, Largest Stalagmite Discovered, Hall Of Giants, Big Room
  13. Large Stalactite Formation In The Kings Palace, Illuminated Stalactite, Man On Right
  14. Rio Frio Cave, Chiquibul Forest Reserve, Belize
  15. Crystal Caves, North Side, Grand Cayman, Cayman Islands, Caribbean, Central America
  16. Italy, Latium, Rome, Anzio, Grotte di Nerone (grotto)
  17. Large Formation At The "Hall Of Giants", In Carlsbad Cavern, Path And Rock Formations
  18. Ice Cave
  19. Moira Gate Arch, Oparara Basin, near Karamea, South Island, New Zealand
  20. Pu'U Pehe Rock Viewed From Shark's Cove, Lanai, Hawaii
  21. Canyon Waterfall
  22. Glacial Ice Is Exposed Inside Of Mendenhall Glacier, Tongass National Forest, Alaska
  23. Large Drapery Formation Known As The Guillatine, And The Pool In The King's Palace
  24. Giant Domes
  25. Italy, Campania, Capri, Boats seen from the White Grotto
  26. Soft corals decorate the ocean caves that line the Nuie coastline, Niue
  27. New Zealand, South Island, West Coast, Limestone Arch, Omarara Basin, Karamea
  28. New Mexico, Carlsbad Caverns National Park
  29. Sunset From A Grotto Cave In La Murgia Belvedere, Matera, Basilicata, Italy
  30. Lincoln Caverns - Huntingdon, Pennsylvania - Blue Version: Retro Travel Poster
  31. Portugal, Faro, Carvoeiro, Fishing Village Of Carvoeiro Perched On A Reef At Sunset
  32. 3rd Eye Cave
  33. In The Queen's Chamber, Stalagmites And Stalactites
  34. Views From A Hole In The Rock Of The First World War, Dolomites, Belluno, Veneto, Italy
  35. Hoarfrost In Canwell Glacie, Alaska
  36. Ice Cave At The Northern Shore Of Glacial Lagoon Jokulsarlon, Northern Europe, Iceland
  37. Hermitage at Wildkirchli (Wild Chapel), Ebenalp, Appenzell Innerrhoden, Switzerland
  38. Close-up of the entrance of a cave
  39. Excavation at Galeria
  40. Rushmore Cave - Keystone, South Dakota - Vintage Sign: Retro Travel Poster
  41. Middle East, Israel, Yam Hamela (Dead Sea), grotto
  42. Diver Inside A Shallow Tide Pool Canyon Near Kaumalapau Harbor, Lanai, Hawaii, USA
  43. Italy, Sardinia, Golfo di Orosei, Grotta del Bue Marino
  44. Carlsbad Caverns National Park, Adventure: Graphic Travel Poster
  45. Carlsbad Caverns National Park, New Mexico - The Big Room: Retro Travel Poster
  46. Mammoth Cave National Park, Cave Entrance: Retro Travel Poster
  47. Italy, Sardinia, Codula di Luna valley, Su Palu cave
  48. Natural Stone Bridge and Caves, Adirondacks, New York