As a result, the domestic price of saltpeter rose and production based on nitrates extracted from caves such as Mammoth Cave became more lucrative.

Mammoth Cave is also the country's 26th national park, covering 52,419 acres of west central Kentucky, a region chock full of caves.

Mammoth Cave, as mentioned, near Bowling Green, about a 90-minute drive south of Louisville.

The cave possesses an intimate hydrologic connection with nearby Mammoth Cave.

Mammoth Cave is a wonder in which draws good society and Stephen shows that he is used to it.

Mammoth Cave is the largest known cave system in the world (367 miles).

He is most closely associated with Mammoth Cave in Kentucky, the world's longest cave, which he has been exploring and writing about since 1954.

Mammoth Cave is a lava tube cave located on the plateau.

In Mammoth Cave, Kentucky, as a girl, she'd stood and felt the same weight in the cool air against her face.

Mammoth Cave was close and the Prince asked to visit it.