He bounded over the crevices in the ice, among which I had walked with caution; his stature, also, as he approached, seemed to exceed that of man. I w...

The great grotto of Guachara, in Colombia, visited by the learned Humboldt; the vast and partially explored Mammoth Cave in Kentucky--what were these ...

It was a glorious sight to see how the electric light brought out the sparkles in the walls of the calcareous rocks, and the old red sandstone. One mi...

There rose high submarine cliffs covered with large weeds. It was about eleven o’clock when Ned Land drew my attention to a formidable pricking, like ...

"Are you convinced?" said my uncle, with a self-satisfied smile. "I am convinced," I cried, "that what I see is incredible." The fact was that my jour...

But that which served as steps under our feet became in other places stalactites. The lava, very porous in certain places, took the form of little rou...