cave 22

Photo

Humboldt Cave

Photo

Pictograph Cave

Photo

Graham Cave

Photo

Vicksburg Siege Cave

Photo

Great Onyx Cave Entrance

Photo

Mammoth Cave Historic District

Photo

Russell Cave National Monument

Photo

Saltpeter cave, Natural Bri...

1900

Photo

Choy Cave, Mexico

1891

Photo

Under the Cave of the Winds

1901

Photo

Demonbreun's Cave

Photo

Robbers Cave State Park

Photo

Interior, Choy Cave, Mexico

1880

Photo

Cave pool, Analomink River,...

1900

Photo

Perry Cave, Put-In-Bay, Ohio

1904

Photo

Anemone Cave, Mt. Desert Is...

1900

Photo

Interior of cave, El Abra, ...

1880

Photo

Exterior, Choy Cave, Mexico

1880

Photo

Interior of the cave of Ela...

1880

Photo

Interior of cave, El Abra, ...

1880