Passageway, Historic Tour, Mammoth Cave National Park, Kentucky
|
Passageway, Historic Tour, Mammoth Cave National Park, Kentucky
|
The Giant’s Coffin in Mammoth Cave
|
Nitrate Mine Works area in Mammoth Cave
|
Gypsum crystal formation on a Mammoth Cave wall
|
The Frozen Niagara formation in Mammoth Cave
|
A large calcite formation in Mammoth Cave
|
Calcite Formations, New Entrance Tour, Mammoth Cave National Park, Kentucky
|
Bloodroot Signs of Spring at Mammoth Cave
|
Part of the frozen Niagra Falls Mammoth Cave.jpg(385)
|
