As I crept along the corridor toward the brighter light I saw later stages of the painted epic—the leave-taking of the race that had dwelt in the nameless city and the valley around for ten million years; the race whose souls shrank from quitting scenes their bodies had known so long where they had settled as nomads in the earth's youth, hewing in the virgin rock those primal shrines at which they had never ceased to worship. Now that the light was better I studied the pictures more closely and, remembering that the strange reptiles must represent the unknown men, pondered upon the customs of the nameless city. Many things were peculiar and inexplicable. The civilization, which included a written alphabet, had seemingly risen to a higher order than those immeasurably later civilizations of Egypt and Chaldaea, yet there were curious omissions. I could, for example, find no pictures to represent deaths or funeral customs, save such as were related to wars, violence, and plagues; and I wondered at the reticence shown concerning natural death. It was as though an ideal of immortality had been fostered as a cheering illusion.
Still nearer the end of the passage was painted scenes of the utmost picturesqueness and extravagance: contrasted views of the nameless city in its desertion and growing ruin, and of the strange new realm of paradise to which the race had hewed its way through the stone. In these views the city and the desert valley were shewn always by moonlight, golden nimbus hovering over the fallen walls, and half-revealing the splendid perfection of former times, shown spectrally and elusively by the artist. The paradisal scenes were almost too extravagant to be believed, portraying a hidden world of eternal day filled with glorious cities and ethereal hills and valleys. At the very last I thought I saw signs of an artistic anticlimax. The paintings were less skillful, and much more bizarre than even the wildest of the earlier scenes. They seemed to record a slow decadence of the ancient stock, coupled with a growing ferocity toward the outside world from which it was driven by the desert. The forms of the people—always represented by the sacred reptiles—appeared to be gradually wasting away, though their spirit as shewn hovering above the ruins by moonlight gained in proportion. Emaciated priests, displayed as reptiles in ornate robes, cursed the upper air and all who breathed it; and one terrible final scene shewed a primitive-looking man, perhaps a pioneer of ancient Irem, the City of Pillars , torn to pieces by members of the elder race. I remember how the Arabs fear the nameless city, and was glad that beyond this place the grey walls and ceiling were bare.
As I viewed the pageant of mural history I had approached very closely to the end of the low-ceiled hall, and was aware of a gate through which came all of the illuminating phosphorescence. Creeping up to it, I cried aloud in transcendent amazement at what lay beyond; for instead of other and brighter chambers there was only an illimitable void of uniform radiance, such one might fancy when gazing down from the peak of Mount Everest upon a sea of sunlit mist. Behind me was a passage so cramped that I could not stand upright in it; before me was an infinity of subterranean effulgence.
Reaching down from the passage into the abyss was the head of a steep flight of steps—small numerous steps like those of black passages I had traversed—but after a few feet the glowing vapours concealed everything. Swung back open against the left-hand wall of the passage was a massive door of brass, incredibly thick and decorated with fantastic bas-reliefs, which could if closed shut the whole inner world of light away from the vaults and passages of rock. I looked at the step, and for the nonce dared not try them. I touched the open brass door, and could not move it. Then I sank prone to the stone floor, my mind aflame with prodigious reflections which not even a death-like exhaustion could banish.
As I lay still with closed eyes, free to ponder, many things I had lightly noted in the frescoes came back to me with new and terrible significance—scenes representing the nameless city in its heyday—the vegetations of the valley around it, and the distant lands with which its merchants traded. The allegory of the crawling creatures puzzled me by its universal prominence, and I wondered that it would be so closely followed in a pictured history of such importance. In the frescoes the nameless city had been shewn in proportions fitted to the reptiles. I wondered what its real proportions and magnificence had been, and reflected a moment on certain oddities I had noticed in the ruins. I thought curiously of the lowness of the primal temples and of the underground corridor, which were doubtless hewn thus out of deference to the reptile deities there honoured; though it perforce reduced the worshipers to crawling. Perhaps the very rites here involved crawling in imitation of the creatures. No religious theory, however, could easily explain why the level passages in that awesome descent should be as low as the temples—or lower, since one cold not even kneel in it. As I thought of the crawling creatures, whose hideous mummified forms were so close to me, I felt a new throb of fear. Mental associations are curious, and I shrank from the idea that except for the poor primitive man torn to pieces in the last painting, mine was the only human form amidst the many relics and symbols of the primordial life.
But as always in my strange and roving existence, wonder soon drove out fear; for the luminous abyss and what it might contain presented a problem worthy of the greatest explorer. That a weird world of mystery lay far down that flight of peculiarly small steps I could not doubt, and I hoped to find there those human memorials which the painted corridor had failed to give. The frescoes had pictured unbelievable cities, and valleys in this lower realm, and my fancy dwelt on the rich and colossal ruins that awaited me.
My fears, indeed, concerned the past rather than the future. Not even the physical horror of my position in that cramped corridor of dead reptiles and antediluvian frescoes, miles below the world I knew and faced by another world of eerie light and mist, could match the lethal dread I felt at the abysmal antiquity of the scene and its soul. An ancientness so vast that measurement is feeble seemed to leer down from the primal stones and rock-hewn temples of the nameless city, while the very latest of the astounding maps in the frescoes shewed oceans and continents that man has forgotten, with only here and there some vaguely familiar outlines. Of what could have happened in the geological ages since the paintings ceased and the death-hating race resentfully succumbed to decay, no man might say. Life had once teemed in these caverns and in the luminous realm beyond; now I was alone with vivid relics, and I trembled to think of the countless ages through which these relics had kept a silent deserted vigil.
Suddenly there came another burst of that acute fear which had intermittently seized me ever since I first saw the terrible valley and the nameless city under a cold moon, and despite my exhaustion I found myself starting frantically to a sitting posture and gazing back along the black corridor toward the tunnels that rose to the outer world. My sensations were like those which had made me shun the nameless city at night, and were as inexplicable as they were poignant. In another moment, however, I received a still greater shock in the form of a definite sound—the first which had broken the utter silence of these tomb-like depths. It was a deep, low moaning, as of a distant throng of condemned spirits, and came from the direction in which I was staring. Its volume rapidly grew, till it soon reverberated rightfully through the low passage, and at the same time I became conscious of an increasing draught of old air, likewise flowing from the tunnels and the city above. The touch of this air seemed to restore my balance, for I instantly recalled the sudden gusts which had risen around the mouth of the abyss each sunset and sunrise, one of which had indeed revealed the hidden tunnels to me. I looked at my watch and saw that sunrise was near, so bracing myself to resist the gale that was sweeping down to its cavern home as it had swept forth at evening. My fear again waned low, since a natural phenomenon tends to dispel broodings over the unknown.