Group of four men entering crawl way inside cave
Mammoth Cave National Park; National Park Service
River shot series, hill at top of Nolin and Green Rivers, up the Nolin, bluff along the Nolin with indian grave on top near Cubby, 1935
Mammoth Cave National Park; National Park Service
Cave guide going down steps in old historic entrance to Mammoth Cave, Roe Estes, 1937
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, Fossil Avenue with four guides shown holding lanterns
Mammoth Cave National Park; National Park Service
Cave, New Discovery, travertine dam with four guides
Mammoth Cave National Park; National Park Service
Seven people in front of Christmas tree with envelopes attached inside Mammoth Cave
Mammoth Cave National Park; National Park Service
New Discovery, gypsum sprouting out of cave floor
Mammoth Cave National Park; National Park Service
New Discovery, groups of workers conducting excavations
Mammoth Cave National Park; National Park Service
Man walking from cave with bucket of water, near Hodgenville, Kentucky
Abraham Lincoln Birthplace National Historical Park
Small cave along dirt road, near Hodgenville, Kentucky
Abraham Lincoln Birthplace National Historical Park
Man kneeling inspecting the floor of cave, near Hodgenville, Kentucky
Abraham Lincoln Birthplace National Historical Park
Small narrow cave along dirt road, near Hodgenville, Kentucky
Abraham Lincoln Birthplace National Historical Park
Tube type cave passage with lighting devices in place, Specimen Avenue
Mammoth Cave National Park; National Park Service
Cave visitors descending the stairs from the corkscrew area of Mammoth Cave
Mammoth Cave National Park; National Park Service
Cave, door at exit of new discovery shaft
Mammoth Cave National Park; National Park Service
Cave entrance under ice and snow
Mammoth Cave National Park; National Park Service
Three women, a guide and a ranger in cave standing on top of leaching vats
Mammoth Cave National Park; National Park Service
Old entrance of Mammoth Cave, bridal altar
Mammoth Cave National Park; National Park Service
Completed pass in old entrance of Mammoth Cave no. 4 landing np-3 project 34, enrollee in foreground showing height of pass
Mammoth Cave National Park; National Park Service
Close view of cave formation crystals in cave
Mammoth Cave National Park; National Park Service
Echo River boat trip, group of two men, one woman, and a guide
Mammoth Cave National Park; National Park Service
Unidentified man seated in cave by upside down well and fountain
Mammoth Cave National Park; National Park Service
Cave visitors on boat ride on Crystal Lake
Mammoth Cave National Park; National Park Service
Small drapery formation in radio room of cave
Mammoth Cave National Park; National Park Service
Trail under construction in no 1 trip of Mammoth Cave, no. 4 landing on Echo River
Mammoth Cave National Park; National Park Service
Close view of fungus in Crystal Cave
Mammoth Cave National Park; National Park Service
Cave, hostess in front of water fountain in Snowball Dining Room
Mammoth Cave National Park; National Park Service
Gypsum flowers in unidentified area of cave
Mammoth Cave National Park; National Park Service
Interior view of cave showing stalactites and stalagmites
Mammoth Cave National Park; National Park Service
Cave, the Elephants Ears, College Heights Avenue
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 visitors, woman standing by cave guide and four small children at Frozen Niagara, foot of falls
Mammoth Cave National Park; National Park Service
Echo River boat trip, group of two men, one woman, and a guide
Mammoth Cave National Park; National Park Service
Armchair, old entrance Mammoth Cave (reversed)
Mammoth Cave National Park; National Park Service
Steel supports and chicken wire cage, lighting formations in great onyx colonnade, improved lighting, Frozen Niagara, 1942
Mammoth Cave National Park; National Park Service
Cave, three women and two guides standing on top of Giant's Coffin
Mammoth Cave National Park; National Park Service
Project 34, steps and guardrail remodeled, complete rails and steps complete in cathedral domes entrance np-3
Mammoth Cave National Park; National Park Service
Caves, onyx chamber (St. Peter's Dome) cave formations
Mammoth Cave National Park; National Park Service
Cave entrance, showing drip line and equipment for digging
Mammoth Cave National Park; National Park Service
Cave trail construction, removal of sand from end of Fossil Ave., 1941
Mammoth Cave National Park; National Park Service
Cave, guide and tour group at Ruins of Karnak
Mammoth Cave National Park; National Park Service
Cave construction, black enrollees working in cave installing improved lighting in Frozen Niagara, 1942
Mammoth Cave National Park; National Park Service
Cave guide and three women on stairs going down to Historic Entrance
Mammoth Cave National Park; National Park Service
Completed pass in old entrance of Mammoth Cave no. 4 landing np-3 project 34, enrollee in foreground showing height of pass
Mammoth Cave National Park; National Park Service
Moving the huge rock from the entrance of Proctor Cave
Mammoth Cave National Park; National Park Service
Before trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Gypsum deposits, unknown location in cave
Mammoth Cave National Park; National Park Service
Large group of visitors in Booth's amphitheater, guide is at opposite side from group
Mammoth Cave National Park; National Park Service
Construction of Mammoth Cave Trail
Mammoth Cave National Park; National Park Service
Young women at bridal alter formation in Gothic Avenue area of cave
Mammoth Cave National Park; National Park Service
Echo River boat trip, two large loads of cave visitors
Mammoth Cave National Park; National Park Service
Cave guide and a group of visitors on boat ride at Echo River
Mammoth Cave National Park; National Park Service
Cover over New Discovery shaft, 1941
Mammoth Cave National Park; National Park Service
Snowball dining room with cave guests eating a meal
Mammoth Cave National Park; National Park Service
Project 34 at cathedral dome, large rock steps and hand rail to be remodeled before
Mammoth Cave National Park; National Park Service
Park rangers examining cave opening
Mammoth Cave National Park; National Park Service
Cave, helictite formations, Morrison Avenue
Mammoth Cave National Park; National Park Service
Young Hunt installing cave lighting on boulder in Frozen Niagara, 1942
Mammoth Cave National Park; National Park Service
Snowball dining room with cave guests eating a meal
Mammoth Cave National Park; National Park Service
Cave construction, New Discovery cave passage with unidentified tools against wall of passage, 1941
Mammoth Cave National Park; National Park Service
Caves, wooden bridge over Echo River
Mammoth Cave National Park; National Park Service
Cave, saltpeter vats, Young Hunt holding lantern
Mammoth Cave National Park; National Park Service
Two CCC enrollees in cave showing top side of trail construction in cave, two fifty gallon drums are in photo
Mammoth Cave National Park; National Park Service
Close, blurry view of cave formations
Mammoth Cave National Park; National Park Service
Gypsum flowers in unidentified area of cave
Mammoth Cave National Park; National Park Service
Caves, Frozen Niagara photographic copy of original taken by Caulfield and Shouk
Mammoth Cave National Park; National Park Service
Cave, Drapery Room formations
Mammoth Cave National Park; National Park Service
Cave, two women and a guide on Crystal Lake boat ride (Echo Dome)
Mammoth Cave National Park; National Park Service
Aerial view of guide and cave visitors on boat ride on Crystal Lake nearing boat landing
Mammoth Cave National Park; National Park Service
Completed pass in old entrance of Mammoth Cave no. 4 landing np-3 project 34, enrollee in foreground showing height of pass
Mammoth Cave National Park; National Park Service
Caves, Gothic Avenue, woman sitting in Jenny Lind's armchair
Mammoth Cave National Park; National Park Service
Looking south at Frozen Niagara entrance before improvement
Mammoth Cave National Park; National Park Service
Guide standing on breakdown, prepared to throw lighted torch in cave
Mammoth Cave National Park; National Park Service
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