Open Parks Network

Cave, New Discovery, survey party on Fossil Avenue Mammoth Cave National Park; National Park Service

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1939-09

Cave, survey party at work during opening of end of Fossil Avenue, 1942 Mammoth Cave National Park; National Park Service

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1942-03

Unidentified cave entrance Mammoth Cave National Park; National Park Service

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1938-06

Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service

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1940-07

Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service

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1940-07

Unidentified cave entrance Mammoth Cave National Park; National Park Service

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1938-06

Frozen Niagara Mammoth Cave National Park; National Park Service

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Circa 1934

Frozen Niagara Mammoth Cave National Park; National Park Service

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Circa 1934

Cave, Eyeless Crayfish Mammoth Cave National Park; National Park Service

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1941-08

Interior of cave Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, Eyeless Crayfish Mammoth Cave National Park; National Park Service

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1941-08

Cave in Cedar Sink Mammoth Cave National Park; National Park Service

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Circa 1930

Tree in cave Mammoth Cave National Park; National Park Service

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1940-12

Cave, saltpeter works Mammoth Cave National Park; National Park Service

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1940-10

Frozen Niagara Mammoth Cave National Park; National Park Service

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Circa 1934

Cave, Frozen Niagara entrance, 1941 Mammoth Cave National Park; National Park Service

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1941-09

Cave cliff walk Mammoth Cave National Park; National Park Service

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1939-03-30

Cave, saltpeter vats Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, saltpeter vats Mammoth Cave National Park; National Park Service

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Circa 1935

Tree in cave Mammoth Cave National Park; National Park Service

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1940-12

Cave formation, Violet City Mammoth Cave National Park; National Park Service

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1939-06

Mammoth Cave, Frozen Niagara Mammoth Cave National Park; National Park Service

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Trail to Historic Entrance Mammoth Cave National Park; National Park Service

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1939-10

View of cave formations Mammoth Cave National Park; National Park Service

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Circa 1930

Cave, New Discovery, Onyx Avenue Mammoth Cave National Park; National Park Service

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Cave, tourists in Corkscrew, 1941 Mammoth Cave National Park; National Park Service

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1941-08

Cave formation, Violet City Mammoth Cave National Park; National Park Service

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1939-06

Interior of narrow cave entrance Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, tourists in Corkscrew, 1941 Mammoth Cave National Park; National Park Service

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1941-08

View of cave formations Mammoth Cave National Park; National Park Service

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Circa 1930

Cave, onyx colonnade formation Mammoth Cave National Park; National Park Service

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Circa 1942

Cave, Drapery Room formations Mammoth Cave National Park; National Park Service

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Circa 1942

View of cave formations Mammoth Cave National Park; National Park Service

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Circa 1930

Caves, Golden Fleece formations Mammoth Cave National Park; National Park Service

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Circa 1942

Completed cave trail Mammoth Cave National Park; National Park Service

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Circa 1935

Completed trail, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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Circa 1941

Passage with rubble Mammoth Cave National Park; National Park Service

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Circa 1935

Trail construction, Fossil Avenue, 1941 Mammoth Cave National Park; National Park Service

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Circa 1941

Completed trail, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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Circa 1941

Cave, New Discovery, Onyx Altar Mammoth Cave National Park; National Park Service

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Cave, Snowball Dining Room Mammoth Cave National Park; National Park Service

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1940-07

Path to Mammoth Cave entrance Mammoth Cave National Park; National Park Service

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1938

Cave, helictite formations, Morrison Avenue Mammoth Cave National Park; National Park Service

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Circa 1942

Number 25, mouth of Crystal Cave Mammoth Cave National Park; National Park Service

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1938

Cave, New Discovery, gypsum Mammoth Cave National Park; National Park Service

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1939-09

Cave, New Discovery, Onyx Altar Mammoth Cave National Park; National Park Service

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Cave, Snowball Dining Room Mammoth Cave National Park; National Park Service

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1940-07

Cave, Mammoth Dome from above, 1941 Mammoth Cave National Park; National Park Service

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1941-08

Cave, helictite formations, Morrison Avenue Mammoth Cave National Park; National Park Service

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Circa 1942

Cave, formations in Fossil Avenue, 1942 Mammoth Cave National Park; National Park Service

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1942-03

Cave, Snowball Dining Room Mammoth Cave National Park; National Park Service

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1940-07

Park ranger examining wall Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, New Discovery, gypsum Mammoth Cave National Park; National Park Service

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1939-09

Man in cave examining rock formation Mammoth Cave National Park; National Park Service

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Cave, New Discovery, needle gypsum Mammoth Cave National Park; National Park Service

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Construction of Mammoth Cave Trail Mammoth Cave National Park; National Park Service

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Circa 1935

Entrance of moonshine cave Mammoth Cave National Park; National Park Service

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Circa 1935

Before trail construction, New Discovery, 1941 Mammoth Cave National Park; National Park Service

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Circa 1941

Entrance of Proctor Cave Mammoth Cave National Park; National Park Service

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Circa 1935

Mammoth Cave, Crystal Lake Mammoth Cave National Park; National Park Service

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Cave, New Discovery, needle gypsum Mammoth Cave National Park; National Park Service

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Column in unidentified area of cave Mammoth Cave National Park; National Park Service

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1940-07

Cave, trail construction, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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1942-03

The path to Mammoth Cave entrance Mammoth Cave National Park; National Park Service

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1938

Cave, rock with gypsum deposits Mammoth Cave National Park; National Park Service

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Circa 1935

Caves, New Discovery, gypsum ribbon Mammoth Cave National Park; National Park Service

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Cave, Mammoth Dome from above, 1941 Mammoth Cave National Park; National Park Service

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1941-08

Before trail construction, New Discovery, 1941 Mammoth Cave National Park; National Park Service

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Circa 1941

Man in cave examining rock formation Mammoth Cave National Park; National Park Service

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Frozen Niagara section of Mammoth Cave Mammoth Cave National Park; National Park Service

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1939-06

Before trail construction, New Discovery, 1941 Mammoth Cave National Park; National Park Service

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Circa 1941

Close, blurry view of cave formations Mammoth Cave National Park; National Park Service

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Circa 1930

Entrance of moonshine cave Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, Hindu Temple, showing cave formations Mammoth Cave National Park; National Park Service

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Circa 1942

Unidentifiable view and location (inside of cave?) Mammoth Cave National Park; National Park Service

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Caves, wooden bridge over Echo River Mammoth Cave National Park; National Park Service

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Circa 1939

Frozen Niagara section of Mammoth Cave Mammoth Cave National Park; National Park Service

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1939-06

Improved cave lighting, Frozen Niagara, 1942 Mammoth Cave National Park; National Park Service

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Circa 1941

Various angles of Frozen Niagara Mammoth Cave National Park; National Park Service

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Circa 1934

Close view of helictites, Crystal Cave Mammoth Cave National Park; National Park Service

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Circa 1930

Portrait of couple taken in cave Mammoth Cave National Park; National Park Service

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Circa 1930

Soldiers entering cave at historic entrance, 1941 Mammoth Cave National Park; National Park Service

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1941-05

Trail construction in cave Mammoth Cave National Park; National Park Service

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Circa 1934

Frozen Niagara section of Mammoth Cave Mammoth Cave National Park; National Park Service

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1939-06

Park rangers examining cave opening Mammoth Cave National Park; National Park Service

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Circa 1935

Entrance of Proctor Cave Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, group descending Historic Entrance stairs Mammoth Cave National Park; National Park Service

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1940-09

Gateway completed at Proctor Cave Mammoth Cave National Park; National Park Service

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Circa 1935

Ruins of Karnak Mammoth Dome, 1937 Mammoth Cave National Park; National Park Service

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1937-01-21

Cave, before trail construction, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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1942-03

New Discovery, excavation work Mammoth Cave National Park; National Park Service

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Various angles of Frozen Niagara Mammoth Cave National Park; National Park Service

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Circa 1934

Cave, before trail construction, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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1942-03

Party in Washington dining room, 1935 Mammoth Cave National Park; National Park Service

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1935-05-03

Cave, visitors enter the Historic Entrance, 1946 Mammoth Cave National Park; National Park Service

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1946-08

Cave, before trail construction, New Discovery, 1942 Mammoth Cave National Park; National Park Service

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1942-03

Gypsum deposits, unknown location in cave Mammoth Cave National Park; National Park Service

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Circa 1935

Cave, New Discovery, Mound City and terraces Mammoth Cave National Park; National Park Service

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Caves, wooden bridge over Echo River Mammoth Cave National Park; National Park Service

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Circa 1939

Gypsum deposits, unknown location in cave Mammoth Cave National Park; National Park Service

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Circa 1935

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