Page:Sketches by Mark Twain.djvu/79

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WEEK later the expedition camped in the midst of a collection of wonderful curiosities. These were a sort of vast caverns of stone that rose singly and in bunches out of the plain by the side of the river which they had first seen when they emerged from the forest. These caverns stood in long straight rows on opposite sides of broad aisles that were bordered with single ranks of trees. The summit of each cavern sloped sharply both ways. Several horizontal rows of great square holes, obstructed by a thin, shiny, transparent substance, pierced the frontage of each cavern. Inside were caverns within caverns; and one might ascend and visit these minor compartments by means of curious winding ways consisting of continuous regular terraces raised above another. There were many hugeshapeless objects in each compartment which were considered to have been living creatures at one time, though now the thin brown