Now when after much toilsomeness they had won clear of that foul tract of morass and quagmire, they came upon vast herds of swine grubbing beneath the oaks, and with them savage-looking swineherds scantily clad in skins.  Still further north they caught sight of the squalid hovels and wood piles of charcoal burners; and still they pursued their way till they cleared the dense forest and beheld before them a long range of hills blue in the distant air.  Towards sundown they came on a stony moorland, rough with heather and bracken and tufts of bent; and when there was but one long band of red light parting the distant land from the low sky, they descried a range of thick posts standing high and black against the red in the heavens.  As they drew near, these, they discovered, were the huge granite pillars of a great ring of stone and of an avenue which led up to it; and in the midst of the ring was a mighty flat stone borne up on three stout pillars, so that it looked like a wondrous stone house of some strong folk of the beginning of days.