| 21. | Cave City's main industry is tourism, thanks to its proximity to Mammoth Cave National Park.
|
| 22. | Kentucky's Mammoth Cave, for instance, shows evidence of prehistoric mining more than a half-mile underground.
|
| 23. | Simons began exploiting Mammoth Cave for its saltpeter reserves.
|
| 24. | In 1874 Procter chartered the Mammoth Cave Railroad with his brother George and other investors.
|
| 25. | Davis McCombs has the cavernous depths of Mammoth Cave.
|
| 26. | "People that share this love of Mammoth Cave, we share some sort of a bond.
|
| 27. | They mined both Mammoth Cave and Salts Cave for gypsum and mirabilite, a salty seasoning.
|
| 28. | From 1991 to 2001, he worked as a Park Ranger at Mammoth Cave National Park.
|
| 29. | Like most major caves, Mammoth Cave was formed by the slow dissolution of limestone by groundwater.
|
| 30. | KY 70 is the main route through Mammoth Cave National Park in Edmonson and Barren Counties.
|
