Later, the same hospitable environment would be used as a campground for ... the river toward the cave entrance before you hop aboard a 25-minute ride down the underground river.

The Park offers a varied selection of cave tours including the developed Cascade Cave with cave formations, colorful limestone, and a 30-foot underground waterfall. Bat Cave and Saltpetre Cave both ...

Carlsbad Caverns is home to some of the most spectacular examples of underground geologic features found anywhere in the United States. Located in southeastern New Mexico, the park contains more than ...

The umbrella leaks at places called sinkholes, from which surface water makes its way underground, eroding the limestone into a honeycomb of caverns. Mammoth, the world's longest known cave system ...

Underground caves include Jewel Cave, the third longest cave in the world, and Wind Cave, located under a wildlife sanctuary. Travel + Leisure is published by Meredith Corporation under license ...