This western curve was the only part of the valley where the walls had been split asunder, and it was a wildly rough and inaccessible corner. Going back a little way, he leaped the stream and headed toward the southern wall. Once out of the oaks he found again the low terrace of aspens, and above that the wide, open terrace fringed by silver spruces. This side of the valley contained the wind or water worn caves. As he pressed on, keeping to the upper terrace, cave after cave opened out of the cliff; now a large one, now a small one. Then yawned, quite suddenly and wonderfully above him, the great cavern of the cliff-dwellers.

It was still a goodly distance, and he tried to imagine, if it appeared so huge from where he stood, what it would be when he got there. He climbed the terrace and then faced a long, gradual ascent of weathered rock and dust, which made climbing too difficult for attention to anything else. At length he entered a zone of shade, and looked up. He stood just within the hollow of a cavern so immense that he had no conception of its real dimensions. The curved roof, stained by ages of leakage, with buff and black and rust-colored streaks, swept up and loomed higher and seemed to soar to the rim of the cliff. Here again was a magnificent arch, such as formed the grand gateway to the valley, only in this instance it formed the dome of a cave instead of the span of a bridge.

Venters passed onward and upward. The stones he dislodged rolled down with strange, hollow crack and roar. He had climbed a hundred rods inward, and yet he had not reached the base of the shelf where the cliff-dwellings rested, a long half-circle of connected stone house, with little dark holes that he had fancied were eyes. At length he gained the base of the shelf, and here found steps cut in the rock. These facilitated climbing, and as he went up he thought how easily this vanished race of men might once have held that stronghold against an army. There was only one possible place to ascend, and this was narrow and steep.

Venters had visited cliff-dwellings before, and they had been in ruins, and of no great character or size but this place was of proportions that stunned him, and it had not been desecrated by the hand of man, nor had it been crumbled by the hand of time. It was a stupendous tomb. It had been a city. It was just as it had been left by its builders. The little houses were there, the smoke-blackened stains of fires, the pieces of pottery scattered about cold hearths, the stone hatchets; and stone pestles and mealing-stones lay beside round holes polished by years of grinding maize--lay there as if they had been carelessly dropped yesterday. But the cliff-dwellers were gone!