Defying the hand of time, the vain inquiry of profane science, the insults of the “revealed” religions, they will disclose their riddles to none but the legatees of those by whom they were entrusted with the Mystery. The key was in the keeping of those who knew how to commune with the invisible Presence, and who had received from the lips of mother Nature herself, her grand truths. And so stand these imperial monuments of long-crumbled dynasties, like mute, forgotten sentinels on the threshold of that unseen world, whose gates are thrown open but to a few elect.