Cave, New Discovery, gypsum which has the appearance of spun glass
Mammoth Cave National Park; National Park Service
Cave, New Discovery, travertine deposits in Fossil Avenue
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum (Little Paradise)
Mammoth Cave National Park; National Park Service
Cave, New Discovery, travertine deposits in Fossil Avenue
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum (Little Paradise)
Mammoth Cave National Park; National Park Service
Cave, New Discovery, concretionary travertine deposit, large basin
Mammoth Cave National Park; National Park Service
Cave, Big Paradise in New Discovery, gypsum, Big Avenue, group of five guides shown
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum in the form of snowballs
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Cave, single man in foreground holding lantern
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum flowers growing on limestone ledge
Mammoth Cave National Park; National Park Service
Cave, New Discovery, fibrous gypsum growing in a cylindrical mass
Mammoth Cave National Park; National Park Service
Cave, New Discovery, a botryoidal form of travertine incrusts this wall
Mammoth Cave National Park; National Park Service
Cave, Frozen Niagara, two women posed
Mammoth Cave National Park; National Park Service
Column in unidentified area of cave
Mammoth Cave National Park; National Park Service
Cave, column with measuring stick against it
Mammoth Cave National Park; National Park Service
Man standing by cave formation
Mammoth Cave National Park; National Park Service
John Nelson with his collection of unique onyx and gypsum formations of Mammoth Cave, which were shown at the Chicago World's Fair in 1893 and have since been on exhibit at a score of state and county fairs
Mammoth Cave National Park; National Park Service
Cave, woman and a guide at the bottom of Frozen Niagara
Mammoth Cave National Park; National Park Service
Cave, wedding at Bridal Altar in Gothic Avenue
Mammoth Cave National Park; National Park Service
Cave, wedding at Bridal Altar in Gothic Avenue
Mammoth Cave National Park; National Park Service
Cave, women and a guide at the bottom of Frozen Niagara
Mammoth Cave National Park; National Park Service
Cave, man looking at formations in Fossil Avenue, 1942
Mammoth Cave National Park; National Park Service
Cave, formations in Fossil Avenue, 1942
Mammoth Cave National Park; National Park Service
Cave, helictite formation in Fossil Avenue found during opening of avenue, 1942
Mammoth Cave National Park; National Park Service
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