'Four Roses' gypsum flowers in Cleveland Avenue area of cave
Mammoth Cave National Park; National Park Service
'Four Roses' gypsum flowers in Cleveland Avenue area of cave
Mammoth Cave National Park; National Park Service
A party taken on bridge over backwater of echo river in old entrance to Mammoth Cave
Mammoth Cave National Park; National Park Service
A school party rests on benches beside the trail in Mammoth Cave, 1938
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
After cave trail construction, New Discovery, 1942
Mammoth Cave National Park; National Park Service
American Legion 4088 Initiation of New Members in the Cave during annual meeting, group portrait
Mammoth Cave National Park; National Park Service
American Legion 4088, with new members in prisoner costumes seated at front, inside cave
Mammoth Cave National Park; National Park Service
Armchair, old entrance Mammoth Cave (reversed)
Mammoth Cave National Park; National Park Service
Army activities at Mammoth Cave, soldiers at Methodist Church
Mammoth Cave National Park; National Park Service
As group of visitors dine in Snowball, squatting guide and a woman play a Philco radio
Mammoth Cave National Park; National Park Service
Baroness von Holstein, Stockholm, cave tour group descending stairs for cave river tour
Mammoth Cave National Park; National Park Service
Baroness von Holstein, Stockholm, cave tour group on boats for cave river tour
Mammoth Cave National Park; National Park Service
Before cave trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Before trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Before trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Before trail construction, New Discovery, 1941
Mammoth Cave National Park; National Park Service
Beginning of the excavation for entrance of the New Discovery, 1940
Mammoth Cave National Park; National Park Service
Black CCC enrollees widening trail in cave, hand napping rock
Mammoth Cave National Park; National Park Service
Black CCC enrollees widening trail in cave, hand napping rock
Mammoth Cave National Park; National Park Service
Bottom of Frozen Niagara section (Drapery Room) of Mammoth Cave
Mammoth Cave National Park; National Park Service
Boys on Kemper Trail, old and new trail on Tribble's Trouble, 1935
Mammoth Cave National Park; National Park Service
Boys on Kemper Trail, old and new trail on Tribble's Trouble, 1935
Mammoth Cave National Park; National Park Service
Bridge before construction in Mammoth Cave, 1938
Mammoth Cave National Park; National Park Service
CCC enrollees hand napping stone for cave trail
Mammoth Cave National Park; National Park Service
Cairns Trail construction cave, no 4 entrance of Mammoth Cave Trail and large cave room, 1935
Mammoth Cave National Park; National Park Service
Carl Hanson measuring stalagmite and stalactite formation, Cox Case, 1939
Mammoth Cave National Park; National Park Service
Carl Hanson measuring stalagmite formation, Cox Case, 1939
Mammoth Cave National Park; National Park Service
Carl Hanson showing height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Carl Hanson showing width of cave, Cox Case
Mammoth Cave National Park; National Park Service
Carry deld(sic) from cathedral domes entrance
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
Cave construction, black enrollees working in cave installing improved lighting in Frozen Niagara, 1942
Mammoth Cave National Park; National Park Service
Cave construction, two black CCC enrollees removing sand in Fossil Avenue, 1942
Mammoth Cave National Park; National Park Service
Cave entrance under ice and snow
Mammoth Cave National Park; National Park Service
Cave entrance under ice and snow
Mammoth Cave National Park; National Park Service
Cave entrance, showing drip line and equipment for digging
Mammoth Cave National Park; National Park Service
Cave entrance, showing drip line and equipment for digging
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
Cave guide and four men on stairs of Historic Entrance to Mammoth Cave
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
Cave guide and three women on stairs going down to Historic Entrance
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 guide going down steps in old historic entrance to Mammoth Cave, Roe Estes, 1937
Mammoth Cave National Park; National Park Service
Cave near Second Creek and Nolin River, note man in center foreground, 1938
Mammoth Cave National Park; National Park Service
Cave tour group climbing up staircase within the Corkscrew, Bandit's Hall
Mammoth Cave National Park; National Park Service
Cave tour group climbing up staircase within the Corkscrew, Bandit's Hall
Mammoth Cave National Park; National Park Service
Cave tour group climbing up staircase within the Corkscrew, Bandit's Hall
Mammoth Cave National Park; National Park Service
Cave trail construction, enrollees working on elevated wooden walkway in cave
Mammoth Cave National Park; National Park Service
Cave trail construction, four enrollees hauling sand for trails in New Discovery, 1942
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 visitors descending the stairs from the corkscrew area of Mammoth Cave
Mammoth Cave National Park; National Park Service
Cave visitors eating a meal in the Snowball Dining Room
Mammoth Cave National Park; National Park Service
Cave visitors eating a meal in the Snowball Dining Room
Mammoth Cave National Park; National Park Service
Cave visitors on boat ride on Crystal Lake
Mammoth Cave National Park; National Park Service
Cave visitors on trail at Dead Sea viewed from catwalk looking back toward River Hall
Mammoth Cave National Park; National Park Service
Cave visitors, Echo River boat trip
Mammoth Cave National Park; National Park Service
Cave visitors, Echo River boat trip
Mammoth Cave National Park; National Park Service
Cave visitors, Echo River boat trip
Mammoth Cave National Park; National Park Service
Cave visitors, Echo River boat trip
Mammoth Cave National Park; National Park Service
Cave visitors, Star Chamber (?) with guide seated on bench
Mammoth Cave National Park; National Park Service
Cave visitors, guide and guests climbing stairway, Vanderbilt Hall
Mammoth Cave National Park; National Park Service
Cave visitors, three sailors and a guide leaving dock in Crystal Lake, boat ride
Mammoth Cave National Park; National Park Service
Cave visitors, three sailors and a guide on boat ride in Crystal Lake
Mammoth Cave National Park; National Park Service
Cave visitors, two men working serving line in Snowball Dining Room electric kitchen, in which coffee and doughnuts are visible
Mammoth Cave National Park; National Park Service
Cave visitors, woman and a guide standing at a Philco radio in an empty Snowball Dining Room
Mammoth Cave National Park; National Park Service
Cave visitors, woman at a Philco radio in Snowball Dining Room while people eat behind her
Mammoth Cave National Park; National Park Service
Cave visitors, woman at a Philco radio in Snowball Dining Room while people eat behind her
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
Cave visitors, woman standing by cave guide and four small children at Frozen Niagara, foot of falls
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, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of ceiling, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Carl Hanson measuring height of formation, Cox Case
Mammoth Cave National Park; National Park Service
Cave, Courier Journal photographer making picture of scientists. Mr. Joseph Mader, Publicity Director, standing at right, 1938
Mammoth Cave National Park; National Park Service
Cave, Crystal Lake boat ride with photographer on landing
Mammoth Cave National Park; National Park Service
Cave, Dead Sea under flood conditions, guide leading large group
Mammoth Cave National Park; National Park Service
Cave, Dr. Kleitman reads a register while Mr.Richardson sleeps in their study of sleep, 1938
Mammoth Cave National Park; National Park Service
Cave, Drapery Room formations
Mammoth Cave National Park; National Park Service
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
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