Cave, Drapery Room stairs and trail
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip with three people in boat
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip, four women, one man, and a guide
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip, four women, one man, and a guide
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip, four women, one man, and a guide
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip, four women, one man, and a guide
Mammoth Cave National Park; National Park Service
Cave, Echo River boat trip, four women, one man, and a guide
Mammoth Cave National Park; National Park Service
Cave, Frozen Niagara entrance, 1941
Mammoth Cave National Park; National Park Service
Cave, Hindu Temple, showing cave formations
Mammoth Cave National Park; National Park Service
Cave, Historic Entrance stairs with two people descending stairs
Mammoth Cave National Park; National Park Service
Cave, Jenny Lind's Armchair with Jean Savage and Jean S. Galloway, 1941
Mammoth Cave National Park; National Park Service
Cave, Jenny Lind's Armchair with Jean Savage and Jean S. Galloway, 1941
Mammoth Cave National Park; National Park Service
Cave, Kate Schwarz at fountain from upside-down-well in Snowball Dining Room, 1941
Mammoth Cave National Park; National Park Service
Cave, Kate Schwarz, hostess, going downstairs to Snowball Dining Room, Carmichael Entrance, 1941
Mammoth Cave National Park; National Park Service
Cave, Kleitman and Richardson experiment, publicity photographs
Mammoth Cave National Park; National Park Service
Cave, Kleitman and Richardson sleep study, publicity photographs
Mammoth Cave National Park; National Park Service
Cave, Major Walter Ulrey of the volunteers of America delivering first religious broadcast from place known as Methodist Church, three fourths of a mile from historic entrance and 360 ft. below the surface, 1936
Mammoth Cave National Park; National Park Service
Cave, Mammoth Dome from above, 1941
Mammoth Cave National Park; National Park Service
Cave, Mammoth Dome from above, 1941
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Cocktail Glass, two guides in photo
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Corner of Paradise, J.H. Mader in picture
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Fossil Avenue with four guides shown holding lanterns
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Mound City and terraces
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Onyx Altar, guide in picture
Mammoth Cave National Park; National Park Service
Cave, New Discovery, Onyx Altar, guides in picture
Mammoth Cave National Park; National Park Service
Cave, New Discovery, White Chimes or Crystal Chandelier
Mammoth Cave National Park; National Park Service
Cave, New Discovery, White Chimes or Crystal Chandelier
Mammoth Cave National Park; National Park Service
Cave, New Discovery, White Chimes or Crystal Chandelier, guide in picture
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, New Discovery, a guide looking at gypsum
Mammoth Cave National Park; National Park Service
Cave, New Discovery, bottom of drill hole, group of five guides
Mammoth Cave National Park; National Park Service
Cave, New Discovery, close up of wall in Paradise Avenue
Mammoth Cave National Park; National Park Service
Cave, New Discovery, concretionary travertine deposit, large basin
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, foot of the Draperies, and flow stone basin
Mammoth Cave National Park; National Park Service
Cave, New Discovery, four tour guides standing under Gypsum Arch
Mammoth Cave National Park; National Park Service
Cave, New Discovery, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum (Little Paradise)
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum (Little Paradise)
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum floral pattern
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum floral pattern
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum floral pattern
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, gypsum in the form of snowballs
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum which has the appearance of spun glass
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum which resembles ginned cotton
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Avenue, group of four guides at the Historic Entrance
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Avenue, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Avenue, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Avenue, group of four guides at the base of the Historic Entrance steps
Mammoth Cave National Park; National Park Service
Cave, New Discovery, gypsum, Big Avenue, group of four guides at the base of the Historic Entrance steps
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, little brown bat hanging from the cave ceiling
Mammoth Cave National Park; National Park Service
Cave, New Discovery, man walking and leaving footprints in the sand, 1938
Mammoth Cave National Park; National Park Service
Cave, New Discovery, mud cracks in lake basin
Mammoth Cave National Park; National Park Service
Cave, New Discovery, raccoon scratches on soft limestone wall
Mammoth Cave National Park; National Park Service
Cave, New Discovery, survey party on Fossil Avenue
Mammoth Cave National Park; National Park Service
Cave, New Discovery, travertine dam with four guides
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, travertine deposits in Fossil Avenue
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, two tour guides standing under Gypsum Arch
Mammoth Cave National Park; National Park Service
Cave, New Discovery, walls of Onyx Avenue, man with lantern in picture
Mammoth Cave National Park; National Park Service
Cave, New Discovery, walls of Onyx Avenue, man with lantern in picture
Mammoth Cave National Park; National Park Service
Cave, Snowball Dining Room being prepared by waitstaff in advance of guests
Mammoth Cave National Park; National Park Service
Cave, Snowball Dining Room diners are listening to ranger naturalist lecture
Mammoth Cave National Park; National Park Service
Cave, Snowball Dining Room diners are listening to ranger naturalist lecture
Mammoth Cave National Park; National Park Service
Cave, Snowball Dining Room diners are talking with ranger naturalist
Mammoth Cave National Park; National Park Service
Cave, Snowball Dining Room empty with waitstaff in place
Mammoth Cave National Park; National Park Service
Cave, a party gets boat ride on Echo River in Mammoth Cave, 1938
Mammoth Cave National Park; National Park Service
Cave, a waiter from hotel bringing lunch and mail to scientists Dr. Nathaniel Kleitman, left, and Bruce Richardson, undergoing experiments in sleep in Mammoth Cave, 1938
Mammoth Cave National Park; National Park Service
Cave, before cave trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Cave, before trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Cave, before trail construction, New Discovery, 1942
Mammoth Cave National Park; National Park Service
Cave, before trail construction, New Discovery, 1942
Mammoth Cave National Park; National Park Service
Cave, before trail construction, New Discovery, 1942
Mammoth Cave National Park; National Park Service
Cave, before trail construction, New Discovery, 1942
Mammoth Cave National Park; National Park Service
Cave, bottom section of Frozen Niagara, also known as King Solomon's Temple
Mammoth Cave National Park; National Park Service
Cave, broadcast by WSM "Men at Work" program, a guide was interviewed taking the regular Frozen Niagara trip, 1939
Mammoth Cave National Park; National Park Service
Cave, broadcast by WSM "Men at Work" program, a guide was interviewed taking the regular Frozen Niagara trip, 1939
Mammoth Cave National Park; National Park Service
Cave, broadcast by WSM "Men at Work" program, a guide was interviewed taking the regular Frozen Niagara trip, 1939
Mammoth Cave National Park; National Park Service
Cave, column with measuring stick against it
Mammoth Cave National Park; National Park Service
Cave, dome found during opening of Fossil Avenue, 1942
Mammoth Cave National Park; National Park Service
Cave, door at exit of new discovery shaft
Mammoth Cave National Park; National Park Service
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