1. Lechugilla Cave, NM Caves

2. Hawaiian Lava Tube Cave

3. Sea Cave

4. Ice Cave

5. Passage in Mammoth Cave

6. Distribution of Limestone Caves

7. Just the Facts… The cave system with the greatest total length of surveyed passage is Mammoth Cave (Kentucky, USA) at 591 kilometers (367 mi) in length. The deepest known cave (measured from its highest entrance to its lowest point) is Voronya Cave (Abkhazia), with a depth of 2,191 meters (7,188 ft).Voronya CaveAbkhazia

10. Speleothems

11. Soda Straws

13. Columns

14. Draperies

15. Flowstone

16. Pearls

17. Rimstone

18. Stalagmites & Stalagtites

19. Helictites

20. TainoTaino petroglyphs (Puerto Rico)petroglyphs

23. Eurycea lucifuga

24. Cave Cricket: Ceuthophilus

25. Mexican Blindcat Prietella phreatophila

26. Cavefish Distribution

27. Satan eurystomus Trogloglanis pattersoni

28. Speoplatyrhinus poulsoni Typhlichthys subterraneus (southern cavefish)

29. Ozark Cavefish, Amblyopsis rosae Eyeless Cavefish, Amblyopsis spelaea

30. Lateral line system

32. Oklahoma Cave Isopod

33. Spider Cave Crayfish

34. Bristly Cave Crayfish

35. Allegheny Woodrat, Neotoma magister

36. Indiana Bat, Myotis sodalis

37. Southern Cavefish, Typhlichthys subterraneus

38. Karst Topography

41. Florida Sinkhole

42. Clarksville Cave

43. Ward’s Entrance

44. The Schoharie Hilton